A programming error has been detected
"It probably is not fatal, but should be reported to the developers nonetheless." I was politely asked to report this so here ya go!
Traceback (most recent call last):
File "src\config.py", line 666, in on_show_avatars_in_roster_checkbutton_toggled
File "src\config.py", line 649, in _get_all_muc_controls
KeyError: u'swissjabber.de'