ImageFile extesion validation fails with: AttributeError: 'list' object has no attribute 'name'

[Maximilian Kindshofer]

I upgraded from 1.11 from 1.10 and I get following error

AttributeError: 'list' object has no attribute 'name'

File "django/core/handlers/exception.py", line 41, in inner

response = get_response(request)

File "django/core/handlers/base.py", line 249, in _legacy_get_response

response = self._get_response(request)

File "django/core/handlers/base.py", line 187, in _get_response

response = self.process_exception_by_middleware(e, request)

File "django/core/handlers/base.py", line 185, in _get_response

response = wrapped_callback(request, *callback_args, callback_kwargs)

File "auftragsverwaltung/views.py", line 292, in bilddokumentation_form

if formset.is_valid():

File "django/forms/formsets.py", line 321, in is_valid

self.errors

File "django/forms/formsets.py", line 295, in errors

self.full_clean()

File "django/forms/formsets.py", line 348, in full_clean

self._errors.append(form.errors)

File "django/forms/forms.py", line 175, in errors

self.full_clean()

File "django/forms/forms.py", line 386, in full_clean

self._post_clean()

File "django/forms/models.py", line 396, in _post_clean

self.instance.full_clean(exclude=exclude, validate_unique=False)

File "django/db/models/base.py", line 1226, in full_clean

self.clean_fields(exclude=exclude)

File "django/db/models/base.py", line 1268, in clean_fields

setattr(self, f.attname, f.clean(raw_value, self))

File "django/db/models/fields/init.py", line 603, in clean

self.run_validators(value)

File "django/db/models/fields/init.py", line 555, in run_validators

v(value)

File "django/core/validators.py", line 476, in call

extension = os.path.splitext(value.name)[1][1:].lower()

self:
<django.core.validators.FileExtensionValidator object at 0x7fee879c6828>
value:
[
<InMemoryUploadedFile: 20170619_150207.jpg (image/jpeg)>
]