consumer _start_event_sink sometimes raises error

[deichmab-draeger]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

error is:

File "C:\develop\sdcsim\SDCSimulator\GuiTestClient\ClientTabs\start_tab.py", line 594, in connect_client
    self.parent.client.start_all(not_subscribed_actions=const.SUBSCRIPTIONS[self.subriptionType.currentText()],
  File "C:\develop\sdcsim\.sdcsim_venv_AMD64_3.9.6\lib\site-packages\sdc11073\consumer\consumerimpl.py", line 458, in start_all
    self._start_event_sink(shared_http_server)
  File "C:\develop\sdcsim\.sdcsim_venv_AMD64_3.9.6\lib\site-packages\sdc11073\consumer\consumerimpl.py", line 651, in _start_event_sink
    self._http_server.dispatcher.register_instance(self.path_prefix, self._msg_converter)
  File "C:\develop\sdcsim\.sdcsim_venv_AMD64_3.9.6\lib\site-packages\sdc11073\httpserver\httpserverimpl.py", line 142, in dispatcher
    return self.httpd.dispatcher
AttributeError: 'NoneType' object has no attribute 'dispatcher'

Expected Behavior

no exception

Minimal Reproducible Example

No response

Solution proposal

No response

Python Version

3.9

Operating system

Windows

Sdc11073 Version

2.0.0a6

Link to sdc11073 Logs

No response

Further Information

Al sleep of one second before calling register_instance fixed the problem, but that is a bad solution.

Participation

• I am willing to submit a pull request to fix this bug.