Today I had another crash of pimatic. It seems this error is related:

06:21:08.063 [pimatic-homeduino] debug: data: "PING"
28 Dec 06:25:56 - [info] [mqtt-broker:4a8ee010.5a2a8] Disconnected from broker: mqtt://localhost:1883
28 Dec 06:26:13 - [info] [mqtt-broker:4a8ee010.5a2a8] Connected to broker: mqtt://localhost:1883
06:26:13.868 [pimatic] error: An uncaught exception occurred: AssertionError: false == true

After that, nothing worked anymore and a restart was needed.

Any ideas to prevent this?