AttributeError at /api/v1/cart/cart-items/gifts/change/7879/
'NoneType' object has no attribute 'base'

Request Method: PATCH
Request URL: http://127.0.0.1:8535/api/v1/cart/cart-items/gifts/change/7879/

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
  23.         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 patch
  229.         return self.partial_update(request, *args, **kwargs)

File "/usr/local/lib/python3.8/site-packages/rest_framework/mixins.py" in partial_update
  82.         return self.update(request, *args, **kwargs)

File "/usr/local/lib/python3.8/site-packages/rest_framework/mixins.py" in update
  67.         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
  436.             value = self.validate(value)

File "/code/server/api/rest/cart/serializers.py" in validate
  272.         descriptor = cart_group.base.content_object

Exception Type: AttributeError at /api/v1/cart/cart-items/gifts/change/7879/
Exception Value: 'NoneType' object has no attribute 'base'