[PyQt] Access Python QObject from QML fails to convert on second call

[Fabian Sturm]

Sorry for no direct reply to my previous message but I somehow never
received it myself. 

I now reduced my code to a short sample:

https://github.com/sturmf/python_samples

In the folder pyqt_combobox_qabstractlistmodel is a small program you
can start with "python3 main.py"

Changing between the currently visible item in the ComboBox produces my
error. Any help to get this sample fixed would be awesome!

Thanks a lot,
Fabian