HA 0.42.2 'Sensor has no attribute _battery_level' error

[proddy]

After the upgrade to 0.42.2 all my sensors are being rejected by HA because of the error:

File "/srv/homeassistant/homeassistant_venv/lib/python3.4/site-packages/homeassistant/components/mysensors.py", line 391, in device_state_attributes
    ATTR_BATTERY_LEVEL: node.battery_level,
  File "/home/homeassistant/.homeassistant/deps/mysensors/__init__.py", line 420, in battery_level
    return self._battery_level
AttributeError: 'Sensor' object has no attribute '_battery_level'` 

I haven't tried rolling back to 0.41 or debugging the code yet. Wanted to throw it out there to see if anyone else has experienced similar behaviour?

[martinhjelmare]

@proddy

Are you using persistence with a pickle file? I think I've found a bug in that scenario.

PR with fix:
https://github.com/home-assistant/home-assistant/pull/7057

[proddy]

Yes, I'm using the persistence & pickle file. The PR fixes the problem. Just tested with latest HA dev branch. Thanks for the quick answer Martin.