Google OAuth Redirect AuthStateMissing error

[gannonprudhomme]

We've been frequently getting the following error on the /complete/google-oauth2/ route:

"Internal Server Error: /complete/google-oauth2/
Traceback (most recent call last):
  File "/layers/google.python.pip/pip/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/layers/google.python.pip/pip/lib/python3.7/site-packages/django/core/handlers/base.py", line 115, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/layers/google.python.pip/pip/lib/python3.7/site-packages/django/core/handlers/base.py", line 113, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/layers/google.python.pip/pip/lib/python3.7/site-packages/django/views/decorators/cache.py", line 44, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
  File "/layers/google.python.pip/pip/lib/python3.7/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
    return view_func(*args, **kwargs)
  File "/layers/google.python.pip/pip/lib/python3.7/site-packages/social_django/utils.py", line 49, in wrapper
    return func(request, backend, *args, **kwargs)
  File "/layers/google.python.pip/pip/lib/python3.7/site-packages/social_django/views.py", line 33, in complete
    *args, **kwargs)
  File "/layers/google.python.pip/pip/lib/python3.7/site-packages/social_core/actions.py", line 45, in do_complete
    user = backend.complete(user=user, *args, **kwargs)
  File "/layers/google.python.pip/pip/lib/python3.7/site-packages/social_core/backends/base.py", line 40, in complete
    return self.auth_complete(*args, **kwargs)
  File "/layers/google.python.pip/pip/lib/python3.7/site-packages/social_core/utils.py", line 248, in wrapper
    return func(*args, **kwargs)
  File "/layers/google.python.pip/pip/lib/python3.7/site-packages/social_core/backends/oauth.py", line 375, in auth_complete
    state = self.validate_state()
  File "/layers/google.python.pip/pip/lib/python3.7/site-packages/social_core/backends/oauth.py", line 87, in validate_state
    raise AuthStateMissing(self, 'state')
social_core.exceptions.AuthStateMissing: Session value state missing." 

Easy way to query on GCP Logs Explorer: severity=(EMERGENCY OR ALERT OR CRITICAL OR ERROR) OR protoPayload.resource =~ "/complete/google-oauth2/.*"