Appdaemon does not work in 0.108.9

After upgrading to 0.108.9, appdaemon doese not work anymore. Following message is shown every 5 seconds:

2020-04-25 15:57:00.764504 INFO HASS: Connected to Home Assistant 0.108.9
2020-04-25 15:57:00.880185 INFO HASS: Evaluating startup conditions
2020-04-25 15:57:01.029976 WARNING HASS: Error getting Home Assistant state for None
2020-04-25 15:57:01.031723 WARNING HASS: Code: 500, error: 500: Internal Server Error
2020-04-25 15:57:01.032818 WARNING HASS: Disconnected from Home Assistant, retrying in 5 seconds

Im running Home Assistant on Hass.io. In 0.108.8, appdaemon was working fine.

Anybody similar experience? HInts?