swe_bench / lite / dev

Task input

3.0: DateTime fields cannot be used as inner field for List or Tuple fields
Between releases 3.0.0rc8 and 3.0.0rc9, `DateTime` fields have started throwing an error when being instantiated as inner fields of container fields like `List` or `Tuple`. The snippet below works in <=3.0.0rc8 and throws the error below in >=3.0.0rc9 (and, worryingly, 3.0.0):

```python
from marshmallow import fields, Schema

class MySchema(Schema):
    times = fields.List(fields.DateTime())

s = MySchema()
```

Traceback:
```
Traceback (most recent call last):
  File "test-mm.py", line 8, in <module>
    s = MySchema()
  File "/Users/victor/.pyenv/versions/marshmallow/lib/python3.6/site-packages/marshmallow/schema.py", line 383, in __init__
    self.fields = self._init_fields()
  File "/Users/victor/.pyenv/versions/marshmallow/lib/python3.6/site-packages/marshmallow/schema.py", line 913, in _init_fields
    self._bind_field(field_name, field_obj)
  File "/Users/victor/.pyenv/versions/marshmallow/lib/python3.6/site-packages/marshmallow/schema.py", line 969, in _bind_field
    field_obj._bind_to_schema(field_name, self)
  File "/Users/victor/.pyenv/versions/marshmallow/lib/python3.6/site-packages/marshmallow/fields.py", line 636, in _bind_to_schema
    self.inner._bind_to_schema(field_name, self)
  File "/Users/victor/.pyenv/versions/marshmallow/lib/python3.6/site-packages/marshmallow/fields.py", line 1117, in _bind_to_schema
    or getattr(schema.opts, self.SCHEMA_OPTS_VAR_NAME)
AttributeError: 'List' object has no attribute 'opts'
```

It seems like it's treating the parent field as a Schema without checking that it is indeed a schema, so the `schema.opts` statement fails as fields don't have an `opts` attribute.

Fix tests

tests/test_fields.py::TestParentAndName::test_datetime_list_inner_format

Regression tests

tests/test_fields.py::test_field_aliases[Integer-Integer]
tests/test_fields.py::test_field_aliases[String-String]
tests/test_fields.py::test_field_aliases[Boolean-Boolean]
tests/test_fields.py::test_field_aliases[Url-Url]
tests/test_fields.py::TestField::test_repr
tests/test_fields.py::TestField::test_error_raised_if_uncallable_validator_passed
tests/test_fields.py::TestField::test_error_raised_if_missing_is_set_on_required_field
tests/test_fields.py::TestField::test_custom_field_receives_attr_and_obj
tests/test_fields.py::TestField::test_custom_field_receives_data_key_if_set
tests/test_fields.py::TestField::test_custom_field_follows_data_key_if_set
tests/test_fields.py::TestParentAndName::test_simple_field_parent_and_name
tests/test_fields.py::TestParentAndName::test_unbound_field_root_returns_none
tests/test_fields.py::TestParentAndName::test_list_field_inner_parent_and_name
tests/test_fields.py::TestParentAndName::test_tuple_field_inner_parent_and_name
tests/test_fields.py::TestParentAndName::test_mapping_field_inner_parent_and_name
tests/test_fields.py::TestParentAndName::test_simple_field_root
tests/test_fields.py::TestParentAndName::test_list_field_inner_root
tests/test_fields.py::TestParentAndName::test_tuple_field_inner_root
tests/test_fields.py::TestParentAndName::test_list_root_inheritance
tests/test_fields.py::TestParentAndName::test_dict_root_inheritance
tests/test_fields.py::TestMetadata::test_extra_metadata_may_be_added_to_field[String]
tests/test_fields.py::TestMetadata::test_extra_metadata_may_be_added_to_field[Integer]
tests/test_fields.py::TestMetadata::test_extra_metadata_may_be_added_to_field[Boolean]
tests/test_fields.py::TestMetadata::test_extra_metadata_may_be_added_to_field[Float]
tests/test_fields.py::TestMetadata::test_extra_metadata_may_be_added_to_field[Number]
tests/test_fields.py::TestMetadata::test_extra_metadata_may_be_added_to_field[DateTime]
tests/test_fields.py::TestMetadata::test_extra_metadata_may_be_added_to_field[Time]
tests/test_fields.py::TestMetadata::test_extra_metadata_may_be_added_to_field[Date]
tests/test_fields.py::TestMetadata::test_extra_metadata_may_be_added_to_field[TimeDelta]
tests/test_fields.py::TestMetadata::test_extra_metadata_may_be_added_to_field[Dict]
tests/test_fields.py::TestMetadata::test_extra_metadata_may_be_added_to_field[Url]
tests/test_fields.py::TestMetadata::test_extra_metadata_may_be_added_to_field[Email]
tests/test_fields.py::TestMetadata::test_extra_metadata_may_be_added_to_field[UUID]
tests/test_fields.py::TestMetadata::test_extra_metadata_may_be_added_to_field[Decimal]
tests/test_fields.py::TestErrorMessages::test_default_error_messages_get_merged_with_parent_error_messages_cstm_msg
tests/test_fields.py::TestErrorMessages::test_default_error_messages_get_merged_with_parent_error_messages
tests/test_fields.py::TestErrorMessages::test_make_error[required-Missing
tests/test_fields.py::TestErrorMessages::test_make_error[null-Field
tests/test_fields.py::TestErrorMessages::test_make_error[custom-Custom
tests/test_fields.py::TestErrorMessages::test_make_error[validator_failed-Invalid
tests/test_fields.py::TestErrorMessages::test_fail[required-Missing
tests/test_fields.py::TestErrorMessages::test_fail[null-Field
tests/test_fields.py::TestErrorMessages::test_fail[custom-Custom
tests/test_fields.py::TestErrorMessages::test_fail[validator_failed-Invalid
tests/test_fields.py::TestErrorMessages::test_make_error_key_doesnt_exist
tests/test_fields.py::TestNestedField::test_nested_only_and_exclude_as_string[only]
tests/test_fields.py::TestNestedField::test_nested_only_and_exclude_as_string[exclude]
tests/test_fields.py::TestNestedField::test_nested_unknown_override[None-exclude]
tests/test_fields.py::TestNestedField::test_nested_unknown_override[None-include]
tests/test_fields.py::TestNestedField::test_nested_unknown_override[None-raise]
tests/test_fields.py::TestNestedField::test_nested_unknown_override[exclude-exclude]
tests/test_fields.py::TestNestedField::test_nested_unknown_override[exclude-include]
tests/test_fields.py::TestNestedField::test_nested_unknown_override[exclude-raise]
tests/test_fields.py::TestNestedField::test_nested_unknown_override[include-exclude]
tests/test_fields.py::TestNestedField::test_nested_unknown_override[include-include]
tests/test_fields.py::TestNestedField::test_nested_unknown_override[include-raise]
tests/test_fields.py::TestNestedField::test_nested_unknown_override[raise-exclude]
tests/test_fields.py::TestNestedField::test_nested_unknown_override[raise-include]
tests/test_fields.py::TestNestedField::test_nested_unknown_override[raise-raise]
tests/test_fields.py::TestListNested::test_list_nested_only_exclude_dump_only_load_only_propagated_to_nested[only]
tests/test_fields.py::TestListNested::test_list_nested_only_exclude_dump_only_load_only_propagated_to_nested[exclude]
tests/test_fields.py::TestListNested::test_list_nested_only_exclude_dump_only_load_only_propagated_to_nested[dump_only]
tests/test_fields.py::TestListNested::test_list_nested_only_exclude_dump_only_load_only_propagated_to_nested[load_only]
tests/test_fields.py::TestListNested::test_list_nested_only_and_exclude_merged_with_nested[only-expected0]
tests/test_fields.py::TestListNested::test_list_nested_only_and_exclude_merged_with_nested[exclude-expected1]
tests/test_fields.py::TestListNested::test_list_nested_partial_propagated_to_nested
tests/test_fields.py::TestTupleNested::test_tuple_nested_only_exclude_dump_only_load_only_propagated_to_nested[dump_only]
tests/test_fields.py::TestTupleNested::test_tuple_nested_only_exclude_dump_only_load_only_propagated_to_nested[load_only]
tests/test_fields.py::TestTupleNested::test_tuple_nested_partial_propagated_to_nested
tests/test_fields.py::TestDictNested::test_dict_nested_only_exclude_dump_only_load_only_propagated_to_nested[only]
tests/test_fields.py::TestDictNested::test_dict_nested_only_exclude_dump_only_load_only_propagated_to_nested[exclude]
tests/test_fields.py::TestDictNested::test_dict_nested_only_exclude_dump_only_load_only_propagated_to_nested[dump_only]
tests/test_fields.py::TestDictNested::test_dict_nested_only_exclude_dump_only_load_only_propagated_to_nested[load_only]
tests/test_fields.py::TestDictNested::test_dict_nested_only_and_exclude_merged_with_nested[only-expected0]
tests/test_fields.py::TestDictNested::test_dict_nested_only_and_exclude_merged_with_nested[exclude-expected1]
tests/test_fields.py::TestDictNested::test_dict_nested_partial_propagated_to_nested

Scorer detail

Patch failed to apply in the official SWE-bench workspace.

Patch text

diff --git a/src/marshmallow/fields.py b/src/marshmallow/fields.py
index 0b18e7dd..55e36e26 100644
--- a/src/marshmallow/fields.py
+++ b/src/marshmallow/fields.py
@@ -1114,7 +1114,7 @@ class DateTime(Field):
         super()._bind_to_schema(field_name, schema)
         self.format = (
             self.format
-            or getattr(schema.opts, self.SCHEMA_OPTS_VAR_NAME)
+            or getattr(self.root.opts, self.SCHEMA_OPTS_VAR_NAME)
             or self.DEFAULT_FORMAT
         )

Stdout

[anthropic-agent] instance=marshmallow-code__marshmallow-1359
[anthropic-agent] repo=marshmallow-code/marshmallow
[anthropic-agent] sandbox=c7346a06-324e-474c-90b4-78ee2907d492
[anthropic-agent] model=claude-sonnet-4-5-20250929
[anthropic-agent] context_files=6
[anthropic-agent] full_file_context=yes
[anthropic-agent] edit_attempts=2

Stderr

[anthropic-agent] Attempt 1: python syntax error in src/marshmallow/fields.py: unexpected indent at line 1120

Agent output

diff --git a/src/marshmallow/fields.py b/src/marshmallow/fields.py
index 0b18e7dd..55e36e26 100644
--- a/src/marshmallow/fields.py
+++ b/src/marshmallow/fields.py
@@ -1114,7 +1114,7 @@ class DateTime(Field):
         super()._bind_to_schema(field_name, schema)
         self.format = (
             self.format
-            or getattr(schema.opts, self.SCHEMA_OPTS_VAR_NAME)
+            or getattr(self.root.opts, self.SCHEMA_OPTS_VAR_NAME)
             or self.DEFAULT_FORMAT
         )

Passing target tests

No fail-to-pass successes recorded yet.

Failing target tests

No fail-to-pass failures recorded yet.

Maintained regression tests

No pass-to-pass successes recorded yet.

Regressed tests

No regression failures recorded yet.

Harness output

error: corrupt patch at line 13

Reference output

diff --git a/src/marshmallow/fields.py b/src/marshmallow/fields.py
--- a/src/marshmallow/fields.py
+++ b/src/marshmallow/fields.py
@@ -1114,7 +1114,7 @@ def _bind_to_schema(self, field_name, schema):
         super()._bind_to_schema(field_name, schema)
         self.format = (
             self.format
-            or getattr(schema.opts, self.SCHEMA_OPTS_VAR_NAME)
+            or getattr(self.root.opts, self.SCHEMA_OPTS_VAR_NAME)
             or self.DEFAULT_FORMAT
         )
 

Task input

[version 2.20.0] TypeError: 'NoneType' object is not subscriptable
After update from version 2.19.5 to 2.20.0 I got error for code like:

```python
from marshmallow import Schema, fields, validates


class Bar(Schema):
    value = fields.String()

    @validates('value')  # <- issue here
    def validate_value(self, value):
        pass


class Foo(Schema):
    bar = fields.Nested(Bar)


sch = Foo()

sch.validate({
    'bar': 'invalid',
})
```

```
Traceback (most recent call last):
  File "/_/bug_mschema.py", line 19, in <module>
    'bar': 'invalid',
  File "/_/env/lib/python3.7/site-packages/marshmallow/schema.py", line 628, in validate
    _, errors = self._do_load(data, many, partial=partial, postprocess=False)
  File "/_/env/lib/python3.7/site-packages/marshmallow/schema.py", line 670, in _do_load
    index_errors=self.opts.index_errors,
  File "/_/env/lib/python3.7/site-packages/marshmallow/marshalling.py", line 292, in deserialize
    index=(index if index_errors else None)
  File "/_/env/lib/python3.7/site-packages/marshmallow/marshalling.py", line 65, in call_and_store
    value = getter_func(data)
  File "/_/env/lib/python3.7/site-packages/marshmallow/marshalling.py", line 285, in <lambda>
    data
  File "/_/env/lib/python3.7/site-packages/marshmallow/fields.py", line 265, in deserialize
    output = self._deserialize(value, attr, data)
  File "/_/env/lib/python3.7/site-packages/marshmallow/fields.py", line 465, in _deserialize
    data, errors = self.schema.load(value)
  File "/_/env/lib/python3.7/site-packages/marshmallow/schema.py", line 588, in load
    result, errors = self._do_load(data, many, partial=partial, postprocess=True)
  File "/_/env/lib/python3.7/site-packages/marshmallow/schema.py", line 674, in _do_load
    self._invoke_field_validators(unmarshal, data=result, many=many)
  File "/_/env/lib/python3.7/site-packages/marshmallow/schema.py", line 894, in _invoke_field_validators
    value = data[field_obj.attribute or field_name]
TypeError: 'NoneType' object is not subscriptable
```

Fix tests

tests/test_marshalling.py::TestUnmarshaller::test_deserialize_wrong_nested_type_with_validates_method

Regression tests

tests/test_marshalling.py::test_missing_is_falsy
tests/test_marshalling.py::TestMarshaller::test_prefix
tests/test_marshalling.py::TestMarshaller::test_marshalling_generator
tests/test_marshalling.py::TestMarshaller::test_default_to_missing
tests/test_marshalling.py::TestMarshaller::test_serialize_fields_with_load_only_param
tests/test_marshalling.py::TestMarshaller::test_missing_data_are_skipped
tests/test_marshalling.py::TestMarshaller::test_serialize_with_load_only_doesnt_validate
tests/test_marshalling.py::TestMarshaller::test_serialize_fields_with_dump_to_param
tests/test_marshalling.py::TestMarshaller::test_serialize_fields_with_dump_to_and_prefix_params
tests/test_marshalling.py::TestMarshaller::test_stores_indices_of_errors_when_many_equals_true
tests/test_marshalling.py::TestMarshaller::test_doesnt_store_errors_when_index_errors_equals_false
tests/test_marshalling.py::TestUnmarshaller::test_extra_data_is_ignored
tests/test_marshalling.py::TestUnmarshaller::test_stores_errors
tests/test_marshalling.py::TestUnmarshaller::test_stores_indices_of_errors_when_many_equals_true
tests/test_marshalling.py::TestUnmarshaller::test_doesnt_store_errors_when_index_errors_equals_false
tests/test_marshalling.py::TestUnmarshaller::test_deserialize
tests/test_marshalling.py::TestUnmarshaller::test_extra_fields
tests/test_marshalling.py::TestUnmarshaller::test_deserialize_many
tests/test_marshalling.py::TestUnmarshaller::test_deserialize_stores_errors
tests/test_marshalling.py::TestUnmarshaller::test_deserialize_fields_with_attribute_param
tests/test_marshalling.py::TestUnmarshaller::test_deserialize_fields_with_load_from_param
tests/test_marshalling.py::TestUnmarshaller::test_deserialize_fields_with_dump_only_param
tests/test_marshalling.py::TestUnmarshaller::test_deserialize_wrong_type_root_data
tests/test_marshalling.py::TestUnmarshaller::test_deserialize_wrong_type_nested_data

Scorer detail

Resolved by official SWE-bench grading. Fail-to-pass: 100%. Pass-to-pass: 100%.

Patch text

diff --git a/src/marshmallow/schema.py b/src/marshmallow/schema.py
index 085c509b..9c5f4d2c 100644
--- a/src/marshmallow/schema.py
+++ b/src/marshmallow/schema.py
@@ -873,6 +873,9 @@ class BaseSchema(base.SchemaABC):
                     continue
                 raise ValueError('"{0}" field does not exist.'.format(field_name))
 
+            if data is None:
+                continue
+
             if many:
                 for idx, item in enumerate(data):
                     try:

Stdout

[anthropic-agent] instance=marshmallow-code__marshmallow-1343
[anthropic-agent] repo=marshmallow-code/marshmallow
[anthropic-agent] sandbox=7cf890f5-a4fc-4265-bf8a-89ec13ab44a7
[anthropic-agent] model=claude-sonnet-4-5-20250929
[anthropic-agent] context_files=5
[anthropic-agent] full_file_context=yes
[anthropic-agent] edit_attempts=2

Stderr

[anthropic-agent] Attempt 1: python syntax error in src/marshmallow/schema.py: invalid syntax at line 897

Agent output

diff --git a/src/marshmallow/schema.py b/src/marshmallow/schema.py
index 085c509b..9c5f4d2c 100644
--- a/src/marshmallow/schema.py
+++ b/src/marshmallow/schema.py
@@ -873,6 +873,9 @@ class BaseSchema(base.SchemaABC):
                     continue
                 raise ValueError('"{0}" field does not exist.'.format(field_name))
 
+            if data is None:
+                continue
+
             if many:
                 for idx, item in enumerate(data):
                     try:

Passing target tests

tests/test_marshalling.py::TestUnmarshaller::test_deserialize_wrong_nested_type_with_validates_method

Failing target tests

No fail-to-pass failures recorded yet.

Maintained regression tests

tests/test_marshalling.py::test_missing_is_falsy
tests/test_marshalling.py::TestMarshaller::test_prefix
tests/test_marshalling.py::TestMarshaller::test_marshalling_generator
tests/test_marshalling.py::TestMarshaller::test_default_to_missing
tests/test_marshalling.py::TestMarshaller::test_serialize_fields_with_load_only_param
tests/test_marshalling.py::TestMarshaller::test_missing_data_are_skipped
tests/test_marshalling.py::TestMarshaller::test_serialize_with_load_only_doesnt_validate
tests/test_marshalling.py::TestMarshaller::test_serialize_fields_with_dump_to_param
tests/test_marshalling.py::TestMarshaller::test_serialize_fields_with_dump_to_and_prefix_params
tests/test_marshalling.py::TestMarshaller::test_stores_indices_of_errors_when_many_equals_true
tests/test_marshalling.py::TestMarshaller::test_doesnt_store_errors_when_index_errors_equals_false
tests/test_marshalling.py::TestUnmarshaller::test_extra_data_is_ignored
tests/test_marshalling.py::TestUnmarshaller::test_stores_errors
tests/test_marshalling.py::TestUnmarshaller::test_stores_indices_of_errors_when_many_equals_true
tests/test_marshalling.py::TestUnmarshaller::test_doesnt_store_errors_when_index_errors_equals_false
tests/test_marshalling.py::TestUnmarshaller::test_deserialize
tests/test_marshalling.py::TestUnmarshaller::test_extra_fields
tests/test_marshalling.py::TestUnmarshaller::test_deserialize_many
tests/test_marshalling.py::TestUnmarshaller::test_deserialize_stores_errors
tests/test_marshalling.py::TestUnmarshaller::test_deserialize_fields_with_attribute_param
tests/test_marshalling.py::TestUnmarshaller::test_deserialize_fields_with_load_from_param
tests/test_marshalling.py::TestUnmarshaller::test_deserialize_fields_with_dump_only_param
tests/test_marshalling.py::TestUnmarshaller::test_deserialize_wrong_type_root_data
tests/test_marshalling.py::TestUnmarshaller::test_deserialize_wrong_type_nested_data

Regressed tests

No regression failures recorded yet.

Harness output

+ source /opt/miniconda3/bin/activate
++ _CONDA_ROOT=/opt/miniconda3
++ . /opt/miniconda3/etc/profile.d/conda.sh
+++ export CONDA_EXE=/opt/miniconda3/bin/conda
+++ CONDA_EXE=/opt/miniconda3/bin/conda
+++ export _CE_M=
+++ _CE_M=
+++ export _CE_CONDA=
+++ _CE_CONDA=
+++ export CONDA_PYTHON_EXE=/opt/miniconda3/bin/python
+++ CONDA_PYTHON_EXE=/opt/miniconda3/bin/python
+++ '[' -z x ']'
++ conda activate
++ local cmd=activate
++ case "$cmd" in
++ __conda_activate activate
++ '[' -n '' ']'
++ local ask_conda
+++ PS1=
+++ __conda_exe shell.posix activate
+++ /opt/miniconda3/bin/conda shell.posix activate
++ ask_conda='PS1='\''(base) '\''
export PATH='\''/opt/miniconda3/bin:/opt/miniconda3/condabin:/opt/miniconda3/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin'\''
export CONDA_PREFIX='\''/opt/miniconda3'\''
export CONDA_SHLVL='\''2'\''
export CONDA_DEFAULT_ENV='\''base'\''
export CONDA_PROMPT_MODIFIER='\''(base) '\''
export CONDA_PREFIX_1='\''/opt/miniconda3/envs/testbed'\''
export CONDA_EXE='\''/opt/miniconda3/bin/conda'\''
export _CE_M='\'''\''
export _CE_CONDA='\'''\''
export CONDA_PYTHON_EXE='\''/opt/miniconda3/bin/python'\'''
++ eval 'PS1='\''(base) '\''
export PATH='\''/opt/miniconda3/bin:/opt/miniconda3/condabin:/opt/miniconda3/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin'\''
export CONDA_PREFIX='\''/opt/miniconda3'\''
export CONDA_SHLVL='\''2'\''
export CONDA_DEFAULT_ENV='\''base'\''
export CONDA_PROMPT_MODIFIER='\''(base) '\''
export CONDA_PREFIX_1='\''/opt/miniconda3/envs/testbed'\''
export CONDA_EXE='\''/opt/miniconda3/bin/conda'\''
export _CE_M='\'''\''
export _CE_CONDA='\'''\''
export CONDA_PYTHON_EXE='\''/opt/miniconda3/bin/python'\'''
+++ PS1='(base) '
+++ export PATH=/opt/miniconda3/bin:/opt/miniconda3/condabin:/opt/miniconda3/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+++ PATH=/opt/miniconda3/bin:/opt/miniconda3/condabin:/opt/miniconda3/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+++ export CONDA_PREFIX=/opt/miniconda3
+++ CONDA_PREFIX=/opt/miniconda3
+++ export CONDA_SHLVL=2
+++ CONDA_SHLVL=2
+++ export CONDA_DEFAULT_ENV=base
+++ CONDA_DEFAULT_ENV=base
+++ export 'CONDA_PROMPT_MODIFIER=(base) '
+++ CONDA_PROMPT_MODIFIER='(base) '
+++ export CONDA_PREFIX_1=/opt/miniconda3/envs/testbed
+++ CONDA_PREFIX_1=/opt/miniconda3/envs/testbed
+++ export CONDA_EXE=/opt/miniconda3/bin/conda
+++ CONDA_EXE=/opt/miniconda3/bin/conda
+++ export _CE_M=
+++ _CE_M=
+++ export _CE_CONDA=
+++ _CE_CONDA=
+++ export CONDA_PYTHON_EXE=/opt/miniconda3/bin/python
+++ CONDA_PYTHON_EXE=/opt/miniconda3/bin/python
++ __conda_hashr
++ '[' -n '' ']'
++ '[' -n '' ']'
++ hash -r
+ conda activate testbed
+ local cmd=activate
+ case "$cmd" in
+ __conda_activate activate testbed
+ '[' -n '' ']'
+ local ask_conda
++ PS1='(base) '
++ __conda_exe shell.posix activate testbed
++ /opt/miniconda3/bin/conda shell.posix activate testbed
+ ask_conda='PS1='\''(testbed) '\''
export PATH='\''/opt/miniconda3/envs/testbed/bin:/opt/miniconda3/condabin:/opt/miniconda3/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin'\''
export CONDA_PREFIX='\''/opt/miniconda3/envs/testbed'\''
export CONDA_SHLVL='\''3'\''
export CONDA_DEFAULT_ENV='\''testbed'\''
export CONDA_PROMPT_MODIFIER='\''(testbed) '\''
export CONDA_PREFIX_2='\''/opt/miniconda3'\''
export CONDA_EXE='\''/opt/miniconda3/bin/conda'\''
export _CE_M='\'''\''
export _CE_CONDA='\'''\''
export CONDA_PYTHON_EXE='\''/opt/miniconda3/bin/python'\'''
+ eval 'PS1='\''(testbed) '\''
export PATH='\''/opt/miniconda3/envs/testbed/bin:/opt/miniconda3/condabin:/opt/miniconda3/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin'\''
export CONDA_PREFIX='\''/opt/miniconda3/envs/testbed'\''
export CONDA_SHLVL='\''3'\''
export CONDA_DEFAULT_ENV='\''testbed'\''
export CONDA_PROMPT_MODIFIER='\''(testbed) '\''
export CONDA_PREFIX_2='\''/opt/miniconda3'\''
export CONDA_EXE='\''/opt/miniconda3/bin/conda'\''
export _CE_M='\'''\''
export _CE_CONDA='\'''\''
export CONDA_PYTHON_EXE='\''/opt/miniconda3/bin/python'\'''
++ PS1='(testbed) '
++ export PATH=/opt/miniconda3/envs/testbed/bin:/opt/miniconda3/condabin:/opt/miniconda3/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
++ PATH=/opt/miniconda3/envs/testbed/bin:/opt/miniconda3/condabin:/opt/miniconda3/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
++ export CONDA_PREFIX=/opt/miniconda3/envs/testbed
++ CONDA_PREFIX=/opt/miniconda3/envs/testbed
++ export CONDA_SHLVL=3
++ CONDA_SHLVL=3
++ export CONDA_DEFAULT_ENV=testbed
++ CONDA_DEFAULT_ENV=testbed
++ export 'CONDA_PROMPT_MODIFIER=(testbed) '
++ CONDA_PROMPT_MODIFIER='(testbed) '
++ export CONDA_PREFIX_2=/opt/miniconda3
++ CONDA_PREFIX_2=/opt/miniconda3
++ export CONDA_EXE=/opt/miniconda3/bin/conda
++ CONDA_EXE=/opt/miniconda3/bin/conda
++ export _CE_M=
++ _CE_M=
++ export _CE_CONDA=
++ _CE_CONDA=
++ export CONDA_PYTHON_EXE=/opt/miniconda3/bin/python
++ CONDA_PYTHON_EXE=/opt/miniconda3/bin/python
+ __conda_hashr
+ '[' -n '' ']'
+ '[' -n '' ']'
+ hash -r
+ cd /testbed
+ git config --global --add safe.directory /testbed
+ cd /testbed
+ git status
On branch dev
Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
	modified:   src/marshmallow/schema.py

no changes added to commit (use "git add" and/or "git commit -a")
+ git show
commit d4f98233971ee3e73bba47026cd77b4ba69a25bb
Author: SWE-bench <setup@swebench.config>
Date:   Tue May 6 23:07:21 2025 +0000

    SWE-bench
+ git -c core.fileMode=false diff 2be2d83a1a9a6d3d9b85804f3ab545cecc409bb0
diff --git a/src/marshmallow/schema.py b/src/marshmallow/schema.py
index 085c509b..9c5f4d2c 100644
--- a/src/marshmallow/schema.py
+++ b/src/marshmallow/schema.py
@@ -873,6 +873,9 @@ class BaseSchema(base.SchemaABC):
                     continue
                 raise ValueError('"{0}" field does not exist.'.format(field_name))
 
+            if data is None:
+                continue
+
             if many:
                 for idx, item in enumerate(data):
                     try:
+ source /opt/miniconda3/bin/activate
++ _CONDA_ROOT=/opt/miniconda3
++ . /opt/miniconda3/etc/profile.d/conda.sh
+++ export CONDA_EXE=/opt/miniconda3/bin/conda
+++ CONDA_EXE=/opt/miniconda3/bin/conda
+++ export _CE_M=
+++ _CE_M=
+++ export _CE_CONDA=
+++ _CE_CONDA=
+++ export CONDA_PYTHON_EXE=/opt/miniconda3/bin/python
+++ CONDA_PYTHON_EXE=/opt/miniconda3/bin/python
+++ '[' -z x ']'
++ conda activate
++ local cmd=activate
++ case "$cmd" in
++ __conda_activate activate
++ '[' -n '' ']'
++ local ask_conda
+++ PS1='(testbed) '
+++ __conda_exe shell.posix activate
+++ /opt/miniconda3/bin/conda shell.posix activate
++ ask_conda='PS1='\''(base) '\''
export PATH='\''/opt/miniconda3/bin:/opt/miniconda3/condabin:/opt/miniconda3/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin'\''
export CONDA_PREFIX='\''/opt/miniconda3'\''
export CONDA_SHLVL='\''4'\''
export CONDA_DEFAULT_ENV='\''base'\''
export CONDA_PROMPT_MODIFIER='\''(base) '\''
export CONDA_PREFIX_3='\''/opt/miniconda3/envs/testbed'\''
export CONDA_EXE='\''/opt/miniconda3/bin/conda'\''
export _CE_M='\'''\''
export _CE_CONDA='\'''\''
export CONDA_PYTHON_EXE='\''/opt/miniconda3/bin/python'\'''
++ eval 'PS1='\''(base) '\''
export PATH='\''/opt/miniconda3/bin:/opt/miniconda3/condabin:/opt/miniconda3/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin'\''
export CONDA_PREFIX='\''/opt/miniconda3'\''
export CONDA_SHLVL='\''4'\''
export CONDA_DEFAULT_ENV='\''base'\''
export CONDA_PROMPT_MODIFIER='\''(base) '\''
export CONDA_PREFIX_3='\''/opt/miniconda3/envs/testbed'\''
export CONDA_EXE='\''/opt/miniconda3/bin/conda'\''
export _CE_M='\'''\''
export _CE_CONDA='\'''\''
export CONDA_PYTHON_EXE='\''/opt/miniconda3/bin/python'\'''
+++ PS1='(base) '
+++ export PATH=/opt/miniconda3/bin:/opt/miniconda3/condabin:/opt/miniconda3/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+++ PATH=/opt/miniconda3/bin:/opt/miniconda3/condabin:/opt/miniconda3/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+++ export CONDA_PREFIX=/opt/miniconda3
+++ CONDA_PREFIX=/opt/miniconda3
+++ export CONDA_SHLVL=4
+++ CONDA_SHLVL=4
+++ export CONDA_DEFAULT_ENV=base
+++ CONDA_DEFAULT_ENV=base
+++ export 'CONDA_PROMPT_MODIFIER=(base) '
+++ CONDA_PROMPT_MODIFIER='(base) '
+++ export CONDA_PREFIX_3=/opt/miniconda3/envs/testbed
+++ CONDA_PREFIX_3=/opt/miniconda3/envs/testbed
+++ export CONDA_EXE=/opt/miniconda3/bin/conda
+++ CONDA_EXE=/opt/miniconda3/bin/conda
+++ export _CE_M=
+++ _CE_M=
+++ export _CE_CONDA=
+++ _CE_CONDA=
+++ export CONDA_PYTHON_EXE=/opt/miniconda3/bin/python
+++ CONDA_PYTHON_EXE=/opt/miniconda3/bin/python
++ __conda_hashr
++ '[' -n '' ']'
++ '[' -n '' ']'
++ hash -r
+ conda activate testbed
+ local cmd=activate
+ case "$cmd" in
+ __conda_activate activate testbed
+ '[' -n '' ']'
+ local ask_conda
++ PS1='(base) '
++ __conda_exe shell.posix activate testbed
++ /opt/miniconda3/bin/conda shell.posix activate testbed
+ ask_conda='PS1='\''(testbed) '\''
export PATH='\''/opt/miniconda3/envs/testbed/bin:/opt/miniconda3/condabin:/opt/miniconda3/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin'\''
export CONDA_PREFIX='\''/opt/miniconda3/envs/testbed'\''
export CONDA_SHLVL='\''5'\''
export CONDA_DEFAULT_ENV='\''testbed'\''
export CONDA_PROMPT_MODIFIER='\''(testbed) '\''
export CONDA_PREFIX_4='\''/opt/miniconda3'\''
export CONDA_EXE='\''/opt/miniconda3/bin/conda'\''
export _CE_M='\'''\''
export _CE_CONDA='\'''\''
export CONDA_PYTHON_EXE='\''/opt/miniconda3/bin/python'\'''
+ eval 'PS1='\''(testbed) '\''
export PATH='\''/opt/miniconda3/envs/testbed/bin:/opt/miniconda3/condabin:/opt/miniconda3/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin'\''
export CONDA_PREFIX='\''/opt/miniconda3/envs/testbed'\''
export CONDA_SHLVL='\''5'\''
export CONDA_DEFAULT_ENV='\''testbed'\''
export CONDA_PROMPT_MODIFIER='\''(testbed) '\''
export CONDA_PREFIX_4='\''/opt/miniconda3'\''
export CONDA_EXE='\''/opt/miniconda3/bin/conda'\''
export _CE_M='\'''\''
export _CE_CONDA='\'''\''
export CONDA_PYTHON_EXE='\''/opt/miniconda3/bin/python'\'''
++ PS1='(testbed) '
++ export PATH=/opt/miniconda3/envs/testbed/bin:/opt/miniconda3/condabin:/opt/miniconda3/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
++ PATH=/opt/miniconda3/envs/testbed/bin:/opt/miniconda3/condabin:/opt/miniconda3/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
++ export CONDA_PREFIX=/opt/miniconda3/envs/testbed
++ CONDA_PREFIX=/opt/miniconda3/envs/testbed
++ export CONDA_SHLVL=5
++ CONDA_SHLVL=5
++ export CONDA_DEFAULT_ENV=testbed
++ CONDA_DEFAULT_ENV=testbed
++ export 'CONDA_PROMPT_MODIFIER=(testbed) '
++ CONDA_PROMPT_MODIFIER='(testbed) '
++ export CONDA_PREFIX_4=/opt/miniconda3
++ CONDA_PREFIX_4=/opt/miniconda3
++ export CONDA_EXE=/opt/miniconda3/bin/conda
++ CONDA_EXE=/opt/miniconda3/bin/conda
++ export _CE_M=
++ _CE_M=
++ export _CE_CONDA=
++ _CE_CONDA=
++ export CONDA_PYTHON_EXE=/opt/miniconda3/bin/python
++ CONDA_PYTHON_EXE=/opt/miniconda3/bin/python
+ __conda_hashr
+ '[' -n '' ']'
+ '[' -n '' ']'
+ hash -r
+ python -m pip install -e '.[dev]'
Obtaining file:///testbed
  Preparing metadata (setup.py): started
  Preparing metadata (setup.py): finished with status 'done'
Requirement already satisfied: python-dateutil in /opt/miniconda3/envs/testbed/lib/python3.9/site-packages (from marshmallow==2.20.0) (2.9.0.post0)
Requirement already satisfied: simplejson in /opt/miniconda3/envs/testbed/lib/python3.9/site-packages (from marshmallow==2.20.0) (3.20.1)
Requirement already satisfied: pytest in /opt/miniconda3/envs/testbed/lib/python3.9/site-packages (from marshmallow==2.20.0) (8.3.5)
Requirement already satisfied: pytz in /opt/miniconda3/envs/testbed/lib/python3.9/site-packages (from marshmallow==2.20.0) (2025.2)
Requirement already satisfied: flake8==3.7.4 in /opt/miniconda3/envs/testbed/lib/python3.9/site-packages (from marshmallow==2.20.0) (3.7.4)
Requirement already satisfied: tox in /opt/miniconda3/envs/testbed/lib/python3.9/site-packages (from marshmallow==2.20.0) (4.25.0)
Requirement already satisfied: entrypoints<0.4.0,>=0.3.0 in /opt/miniconda3/envs/testbed/lib/python3.9/site-packages (from flake8==3.7.4->marshmallow==2.20.0) (0.3)
Requirement already satisfied: pyflakes<2.2.0,>=2.1.0 in /opt/miniconda3/envs/testbed/lib/python3.9/site-packages (from flake8==3.7.4->marshmallow==2.20.0) (2.1.1)
Requirement already satisfied: pycodestyle<2.6.0,>=2.5.0 in /opt/miniconda3/envs/testbed/lib/python3.9/site-packages (from flake8==3.7.4->marshmallow==2.20.0) (2.5.0)
Requirement already satisfied: mccabe<0.7.0,>=0.6.0 in /opt/miniconda3/envs/testbed/lib/python3.9/site-packages (from flake8==3.7.4->marshmallow==2.20.0) (0.6.1)
Requirement already satisfied: exceptiongroup>=1.0.0rc8 in /opt/miniconda3/envs/testbed/lib/python3.9/site-packages (from pytest->marshmallow==2.20.0) (1.2.2)
Requirement already satisfied: iniconfig in /opt/miniconda3/envs/testbed/lib/python3.9/site-packages (from pytest->marshmallow==2.20.0) (2.1.0)
Requirement already satisfied: packaging in /opt/miniconda3/envs/testbed/lib/python3.9/site-packages (from pytest->marshmallow==2.20.0) (25.0)
Requirement already satisfied: pluggy<2,>=1.5 in /opt/miniconda3/envs/testbed/lib/python3.9/site-packages (from pytest->marshmallow==2.20.0) (1.5.0)
Requirement already satisfied: tomli>=1 in /opt/miniconda3/envs/testbed/lib/python3.9/site-packages (from pytest->marshmallow==2.20.0) (2.2.1)
Requirement already satisfied: six>=1.5 in /opt/miniconda3/envs/testbed/lib/python3.9/site-packages (from python-dateutil->marshmallow==2.20.0) (1.17.0)
Requirement already satisfied: cachetools>=5.5.1 in /opt/miniconda3/envs/testbed/lib/python3.9/site-packages (from tox->marshmallow==2.20.0) (5.5.2)
Requirement already satisfied: chardet>=5.2 in /opt/miniconda3/envs/testbed/lib/python3.9/site-packages (from tox->marshmallow==2.20.0) (5.2.0)
Requirement already satisfied: colorama>=0.4.6 in /opt/miniconda3/envs/testbed/lib/python3.9/site-packages (from tox->marshmallow==2.20.0) (0.4.6)
Requirement already satisfied: filelock>=3.16.1 in /opt/miniconda3/envs/testbed/lib/python3.9/site-packages (from tox->marshmallow==2.20.0) (3.18.0)
Requirement already satisfied: platformdirs>=4.3.6 in /opt/miniconda3/envs/testbed/lib/python3.9/site-packages (from tox->marshmallow==2.20.0) (4.3.7)
Requirement already satisfied: pyproject-api>=1.8 in /opt/miniconda3/envs/testbed/lib/python3.9/site-packages (from tox->marshmallow==2.20.0) (1.9.0)
Requirement already satisfied: typing-extensions>=4.12.2 in /opt/miniconda3/envs/testbed/lib/python3.9/site-packages (from tox->marshmallow==2.20.0) (4.15.0)
Requirement already satisfied: virtualenv>=20.29.1 in /opt/miniconda3/envs/testbed/lib/python3.9/site-packages (from tox->marshmallow==2.20.0) (20.31.1)
Requirement already satisfied: distlib<1,>=0.3.7 in /opt/miniconda3/envs/testbed/lib/python3.9/site-packages (from virtualenv>=20.29.1->tox->marshmallow==2.20.0) (0.3.9)
Installing collected packages: marshmallow
  Attempting uninstall: marshmallow
    Found existing installation: marshmallow 2.20.0
    Uninstalling marshmallow-2.20.0:
      Successfully uninstalled marshmallow-2.20.0
  DEPRECATION: Legacy editable install of marshmallow[dev]==2.20.0 from file:///testbed (setup.py develop) is deprecated. pip 25.3 will enforce this behaviour change. A possible replacement is to add a pyproject.toml or enable --use-pep517, and use setuptools >= 64. If the resulting installation is not behaving as expected, try using --config-settings editable_mode=compat. Please consult the setuptools documentation for more information. Discussion can be found at https://github.com/pypa/pip/issues/11457
  Running setup.py develop for marshmallow
Successfully installed marshmallow
WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager, possibly rendering your system unusable. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv. Use the --root-user-action option if you know what you are doing and want to suppress this warning.
+ git checkout 2be2d83a1a9a6d3d9b85804f3ab545cecc409bb0 tests/test_marshalling.py
Updated 0 paths from a3815758
+ git apply -v -
Checking patch tests/test_marshalling.py...
Applied patch tests/test_marshalling.py cleanly.
+ : '>>>>> Start Test Output'
+ pytest -rA tests/test_marshalling.py
============================= test session starts ==============================
platform linux -- Python 3.9.21, pytest-8.3.5, pluggy-1.5.0 -- /opt/miniconda3/envs/testbed/bin/python
cachedir: .pytest_cache
rootdir: /testbed
configfile: setup.cfg
plugins: anyio-4.12.1
collecting ... collected 25 items

tests/test_marshalling.py::test_missing_is_falsy PASSED                  [  4%]
tests/test_marshalling.py::TestMarshaller::test_prefix PASSED            [  8%]
tests/test_marshalling.py::TestMarshaller::test_marshalling_generator PASSED [ 12%]
tests/test_marshalling.py::TestMarshaller::test_default_to_missing PASSED [ 16%]
tests/test_marshalling.py::TestMarshaller::test_serialize_fields_with_load_only_param PASSED [ 20%]
tests/test_marshalling.py::TestMarshaller::test_missing_data_are_skipped PASSED [ 24%]
tests/test_marshalling.py::TestMarshaller::test_serialize_with_load_only_doesnt_validate PASSED [ 28%]
tests/test_marshalling.py::TestMarshaller::test_serialize_fields_with_dump_to_param PASSED [ 32%]
tests/test_marshalling.py::TestMarshaller::test_serialize_fields_with_dump_to_and_prefix_params PASSED [ 36%]
tests/test_marshalling.py::TestMarshaller::test_stores_indices_of_errors_when_many_equals_true PASSED [ 40%]
tests/test_marshalling.py::TestMarshaller::test_doesnt_store_errors_when_index_errors_equals_false PASSED [ 44%]
tests/test_marshalling.py::TestUnmarshaller::test_extra_data_is_ignored PASSED [ 48%]
tests/test_marshalling.py::TestUnmarshaller::test_stores_errors PASSED   [ 52%]
tests/test_marshalling.py::TestUnmarshaller::test_stores_indices_of_errors_when_many_equals_true PASSED [ 56%]
tests/test_marshalling.py::TestUnmarshaller::test_doesnt_store_errors_when_index_errors_equals_false PASSED [ 60%]
tests/test_marshalling.py::TestUnmarshaller::test_deserialize PASSED     [ 64%]
tests/test_marshalling.py::TestUnmarshaller::test_extra_fields PASSED    [ 68%]
tests/test_marshalling.py::TestUnmarshaller::test_deserialize_many PASSED [ 72%]
tests/test_marshalling.py::TestUnmarshaller::test_deserialize_stores_errors PASSED [ 76%]
tests/test_marshalling.py::TestUnmarshaller::test_deserialize_fields_with_attribute_param PASSED [ 80%]
tests/test_marshalling.py::TestUnmarshaller::test_deserialize_fields_with_load_from_param PASSED [ 84%]
tests/test_marshalling.py::TestUnmarshaller::test_deserialize_fields_with_dump_only_param PASSED [ 88%]
tests/test_marshalling.py::TestUnmarshaller::test_deserialize_wrong_type_root_data PASSED [ 92%]
tests/test_marshalling.py::TestUnmarshaller::test_deserialize_wrong_type_nested_data PASSED [ 96%]
tests/test_marshalling.py::TestUnmarshaller::test_deserialize_wrong_nested_type_with_validates_method PASSED [100%]

=============================== warnings summary ===============================
src/marshmallow/__init__.py:19
  /testbed/src/marshmallow/__init__.py:19: DeprecationWarning: distutils Version classes are deprecated. Use packaging.version instead.
    __version_info__ = tuple(LooseVersion(__version__).version)

tests/test_marshalling.py::TestUnmarshaller::test_extra_data_is_ignored
  /testbed/src/marshmallow/marshalling.py:253: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3, and in 3.10 it will stop working
    if not isinstance(data, collections.Mapping):

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
==================================== PASSES ====================================
=========================== short test summary info ============================
PASSED tests/test_marshalling.py::test_missing_is_falsy
PASSED tests/test_marshalling.py::TestMarshaller::test_prefix
PASSED tests/test_marshalling.py::TestMarshaller::test_marshalling_generator
PASSED tests/test_marshalling.py::TestMarshaller::test_default_to_missing
PASSED tests/test_marshalling.py::TestMarshaller::test_serialize_fields_with_load_only_param
PASSED tests/test_marshalling.py::TestMarshaller::test_missing_data_are_skipped
PASSED tests/test_marshalling.py::TestMarshaller::test_serialize_with_load_only_doesnt_validate
PASSED tests/test_marshalling.py::TestMarshaller::test_serialize_fields_with_dump_to_param
PASSED tests/test_marshalling.py::TestMarshaller::test_serialize_fields_with_dump_to_and_prefix_params
PASSED tests/test_marshalling.py::TestMarshaller::test_stores_indices_of_errors_when_many_equals_true
PASSED tests/test_marshalling.py::TestMarshaller::test_doesnt_store_errors_when_index_errors_equals_false
PASSED tests/test_marshalling.py::TestUnmarshaller::test_extra_data_is_ignored
PASSED tests/test_marshalling.py::TestUnmarshaller::test_stores_errors
PASSED tests/test_marshalling.py::TestUnmarshaller::test_stores_indices_of_errors_when_many_equals_true
PASSED tests/test_marshalling.py::TestUnmarshaller::test_doesnt_store_errors_when_index_errors_equals_false
PASSED tests/test_marshalling.py::TestUnmarshaller::test_deserialize
PASSED tests/test_marshalling.py::TestUnmarshaller::test_extra_fields
PASSED tests/test_marshalling.py::TestUnmarshaller::test_deserialize_many
PASSED tests/test_marshalling.py::TestUnmarshaller::test_deserialize_stores_errors
PASSED tests/test_marshalling.py::TestUnmarshaller::test_deserialize_fields_with_attribute_param
PASSED tests/test_marshalling.py::TestUnmarshaller::test_deserialize_fields_with_load_from_param
PASSED tests/test_marshalling.py::TestUnmarshaller::test_deserialize_fields_with_dump_only_param
PASSED tests/test_marshalling.py::TestUnmarshaller::test_deserialize_wrong_type_root_data
PASSED tests/test_marshalling.py::TestUnmarshaller::test_deserialize_wrong_type_nested_data
PASSED tests/test_marshalling.py::TestUnmarshaller::test_deserialize_wrong_nested_type_with_validates_method
======================== 25 passed, 2 warnings in 0.04s ========================
+ : '>>>>> End Test Output'
+ git checkout 2be2d83a1a9a6d3d9b85804f3ab545cecc409bb0 tests/test_marshalling.py
Updated 1 path from a3815758

Reference output

diff --git a/src/marshmallow/schema.py b/src/marshmallow/schema.py
--- a/src/marshmallow/schema.py
+++ b/src/marshmallow/schema.py
@@ -877,7 +877,7 @@ def _invoke_field_validators(self, unmarshal, data, many):
                 for idx, item in enumerate(data):
                     try:
                         value = item[field_obj.attribute or field_name]
-                    except KeyError:
+                    except (KeyError, TypeError):
                         pass
                     else:
                         validated_value = unmarshal.call_and_store(
@@ -892,7 +892,7 @@ def _invoke_field_validators(self, unmarshal, data, many):
             else:
                 try:
                     value = data[field_obj.attribute or field_name]
-                except KeyError:
+                except (KeyError, TypeError):
                     pass
                 else:
                     validated_value = unmarshal.call_and_store(