'dict' object has no attribute '_mutable'

The last querydict fix i put in triggered this occasional bug from emfollow's posts:

Traceback (most recent call last):
  File "/usr/local/lib/python3.7/dist-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/usr/local/lib/python3.7/dist-packages/django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/usr/local/lib/python3.7/dist-packages/django/views/decorators/cache.py", line 44, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
    return view_func(*args, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/django/views/generic/base.py", line 70, in view
    return self.dispatch(request, *args, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/rest_framework/views.py", line 509, in dispatch
    response = self.handle_exception(exc)
  File "/usr/local/lib/python3.7/dist-packages/rest_framework/views.py", line 469, in handle_exception
    self.raise_uncaught_exception(exc)
  File "/usr/local/lib/python3.7/dist-packages/rest_framework/views.py", line 480, in raise_uncaught_exception
    raise exc
  File "/usr/local/lib/python3.7/dist-packages/rest_framework/views.py", line 506, in dispatch
    response = handler(request, *args, **kwargs)
  File "/app/gracedb_project/gracedb/api/v1/events/views.py", line 115, in inner
    return view(self, request, event, *args, **kwargs)
  File "/app/gracedb_project/gracedb/api/v1/events/views.py", line 941, in post
    mutable = request.data._mutable # save state

Exception Type: AttributeError at /api/events/M428754/log/
Exception Value: 'dict' object has no attribute '_mutable'
Request information:
USER: emfollow

GET: No GET data

POST: No POST data

FILES: No FILES data

Although it looks like it's a POST with no response? Double check with GWCelery's sentry