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Versions

• OS: Ubuntu 19.10
• GTK Version: 3.24.12
• PyGObject Version: 3.34.0
• GLib Version : 2.62.0
• python-nbxmpp Version: 0.9.93
• Gajim Version: 1.1.92+e86951bd4

Traceback

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/gi/overrides/GLib.py", line 664, in <lambda>
    func_fdtransform = lambda _, cond, *data: callback(channel, cond, *data)
  File "/usr/lib/python3/dist-packages/nbxmpp/idlequeue.py", line 554, in _process_events
    return IdleQueue._process_events(self, fd, flags)
  File "/usr/lib/python3/dist-packages/nbxmpp/idlequeue.py", line 405, in _process_events
    obj.pollin()
  File "/usr/lib/python3/dist-packages/nbxmpp/transports.py", line 443, in pollin
    self._do_receive()
  File "/usr/lib/python3/dist-packages/nbxmpp/transports.py", line 664, in _do_receive
    self._on_receive(received)
  File "/usr/lib/python3/dist-packages/nbxmpp/transports.py", line 678, in _on_receive
    self.on_receive(data)
  File "/usr/lib/python3/dist-packages/nbxmpp/dispatcher.py", line 325, in ProcessNonBlocking
    self.Stream.Parse(data)
  File "../Modules/pyexpat.c", line 469, in EndElement
  File "/usr/lib/python3/dist-packages/nbxmpp/simplexml.py", line 642, in endtag
    self.dispatch(self._mini_dom)
  File "/usr/lib/python3/dist-packages/nbxmpp/dispatcher.py", line 618, in dispatch
    cb(self, stanza, **args)
  File "/usr/lib/python3/dist-packages/nbxmpp/util.py", line 112, in func_wrapper
    cb()(result, user_data)
  File "/home/marza/.local/share/gajim/plugins/omemo/modules/omemo.py", line 481, in _devicelist_received
    self._process_devicelist_update(jid, devicelist)
  File "/home/marza/.local/share/gajim/plugins/omemo/modules/omemo.py", line 499, in _process_devicelist_update
    self.backend.update_devicelist(jid, list(devicelist))
TypeError: 'NoneType' object is not iterable

Steps to reproduce the problem

It happens every time when I start Gajim

If I switch OMEMO off it doesn't happen.