AttributeError at /api/v1/store/products/pages/create/
'NoneType' object has no attribute 'lower'


Traceback:

File "/usr/local/lib/python3.8/site-packages/django/core/handlers/exception.py" in inner
  34.             response = get_response(request)

File "/usr/local/lib/python3.8/site-packages/django/core/handlers/base.py" in _get_response
  115.                 response = self.process_exception_by_middleware(e, request)

File "/usr/local/lib/python3.8/site-packages/django/core/handlers/base.py" in _get_response
  113.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/usr/local/lib/python3.8/site-packages/django/views/decorators/csrf.py" in wrapped_view
  54.         return view_func(*args, **kwargs)

File "/usr/local/lib/python3.8/site-packages/django/views/generic/base.py" in view
  71.             return self.dispatch(request, *args, **kwargs)

File "/code/server/shared/rest/mixins.py" in dispatch
  24.         return super().dispatch(request, *args, **kwargs)

File "/usr/local/lib/python3.8/site-packages/rest_framework/views.py" in dispatch
  505.             response = self.handle_exception(exc)

File "/usr/local/lib/python3.8/site-packages/rest_framework/views.py" in handle_exception
  465.             self.raise_uncaught_exception(exc)

File "/usr/local/lib/python3.8/site-packages/rest_framework/views.py" in raise_uncaught_exception
  476.         raise exc

File "/usr/local/lib/python3.8/site-packages/rest_framework/views.py" in dispatch
  502.             response = handler(request, *args, **kwargs)

File "/usr/local/lib/python3.8/site-packages/rest_framework/generics.py" in post
  190.         return self.create(request, *args, **kwargs)

File "/usr/local/lib/python3.8/site-packages/rest_framework/mixins.py" in create
  18.         serializer.is_valid(raise_exception=True)

File "/usr/local/lib/python3.8/site-packages/rest_framework/serializers.py" in is_valid
  234.                 self._validated_data = self.run_validation(self.initial_data)

File "/usr/local/lib/python3.8/site-packages/rest_framework/serializers.py" in run_validation
  433.         value = self.to_internal_value(data)

File "/usr/local/lib/python3.8/site-packages/rest_framework/serializers.py" in to_internal_value
  490.                 validated_value = field.run_validation(primitive_value)

File "/usr/local/lib/python3.8/site-packages/rest_framework/serializers.py" in run_validation
  621.         value = self.to_internal_value(data)

File "/usr/local/lib/python3.8/site-packages/rest_framework/serializers.py" in to_internal_value
  657.                 validated = self.child.run_validation(item)

File "/usr/local/lib/python3.8/site-packages/rest_framework/serializers.py" in run_validation
  433.         value = self.to_internal_value(data)

File "/usr/local/lib/python3.8/site-packages/rest_framework/serializers.py" in to_internal_value
  490.                 validated_value = field.run_validation(primitive_value)

File "/usr/local/lib/python3.8/site-packages/rest_framework/fields.py" in run_validation
  565.         value = self.to_internal_value(data)

File "/code/server/shared/rest/fields.py" in to_internal_value
  252.             file_extension = self.get_file_extension(file_name, decoded_file, base64_data)

File "/code/server/shared/rest/fields.py" in get_file_extension
  355.         return guess_extension(guess_type(base64_data)[0])