docker monitor error

Exception in thread Thread-16:
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/threading.py", line 926, in _bootstrap_inner
    self.run()
  File "/usr/local/lib/python3.7/threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "/config/custom_components/docker_monitor/__init__.py", line 456, in _runnable
    self._notify(stats)
  File "/config/custom_components/docker_monitor/__init__.py", line 351, in _notify
    callback(message)
  File "/config/custom_components/docker_monitor/switch.py", line 71, in update_callback
    self.schedule_update_ha_state()
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 405, in schedule_update_ha_state
    self.hass.add_job(self.async_update_ha_state(force_refresh))
AttributeError: 'NoneType' object has no attribute 'add_job'