[omemo] Error in _process_mam_message properties.muc_user.jid 'NoneType' object has no attribute 'jid'

Versions

OS: Linux
GTK Version: 3.24.12
PyGObject Version: 3.34.0
GLib Version : 2.62.0
python-nbxmpp Version: 0.9.92
Gajim Version: 1.1.92+gajim@96d6d5d5

Traceback

Traceback (most recent call last):
  File "/home/simon/code/gajim/python-nbxmpp/nbxmpp/dispatcher.py", line 652, in dispatch
    handler['func'](session, stanza, properties)
  File "/home/simon/code/gajim/config/plugins.testprofile/omemo/modules/omemo.py", line 213, in _message_received
    from_jid = self._process_mam_message(properties)
  File "/home/simon/code/gajim/config/plugins.testprofile/omemo/modules/omemo.py", line 276, in _process_mam_message
    if properties.muc_user.jid is None:
AttributeError: 'NoneType' object has no attribute 'jid'

Edited Nov 07, 2019 by Daniel Brötzmann