Sometimes no status change when shutting down

[salopeknet]

Hello!
I'm running your addon with Kodi 18.1, Libreelec 9.1 on a RPi3, connected to a CCU2. Great thing, thank you!!
The change of the variable on the CCU ist working mostly fine, except of when shutting down Kodi & the RPi. Sometimes the state stays stuck on the last before shutting down, and no change is sent to the CCU.

Seems like this happens only when the last state during requesting a shutdown is "Audio/Video playback start": Kodi shuts down, the state stays the same.
If I stop all playbacks before requesting a shutdown, the state gets changed to "Shutwown", like it should.

Can you have a look at this, please? Do you need some more data from me?