ValueError: self.config should be None, but is Documentation

[blaise-io]

  File "flask/app.py", line 2073, in wsgi_app
    response = self.full_dispatch_request()
  File "flask/app.py", line 1511, in full_dispatch_request
    self.try_trigger_before_first_request_functions()
  File "flask/app.py", line 1563, in try_trigger_before_first_request_functions
    self.ensure_sync(func)()
  File "openapi_builder/builder.py", line 113, in <lambda>
    app.before_first_request(lambda: self.builder.iterate_endpoints())
  File "openapi_builder/builder.py", line 162, in iterate_endpoints
    with self.config_manager.use_documentation_context(config):
  File "python3.6/contextlib.py", line 81, in __enter__
    return next(self.gen)
  File "openapi_builder/documentation.py", line 70, in use_documentation_context
    raise ValueError(f"self.config should be None, but is {self.config}")

Our setup is with multiple Apache workers in separate processes, no threading.

Is this reproducible by calling self.builder.iterate_endpoints() multiple times?

Does https://github.com/FlyingBird95/openapi-builder/blob/master/openapi_builder/documentation.py#L63 need a contextmanager?