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Versions

• OS: Ubuntu 19.04
• GTK+ Version: 3.24.8
• PyGObject Version: 3.32.0
• python-nbxmpp Version: 0.6.10
• Gajim Version: 1.1.3+gajim@b63dd2ed

Traceback

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/nbxmpp/dispatcher_nb.py", line 231, in ProcessNonBlocking
    self.Stream.Parse(data)
xml.parsers.expat.ExpatError: XML or text declaration not at start of entity: line 1, column 362

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/gi/overrides/GLib.py", line 662, in <lambda>
    func_fdtransform = lambda _, cond, *data: callback(channel, cond, *data)
  File "/usr/lib/python3/dist-packages/nbxmpp/idlequeue.py", line 563, in _process_events
    return IdleQueue._process_events(self, fd, flags)
  File "/usr/lib/python3/dist-packages/nbxmpp/idlequeue.py", line 411, in _process_events
    obj.pollin()
  File "/usr/lib/python3/dist-packages/nbxmpp/transports_nb.py", line 451, in pollin
    self._do_receive()
  File "/usr/lib/python3/dist-packages/nbxmpp/transports_nb.py", line 676, in _do_receive
    self._on_receive(received)
  File "/usr/lib/python3/dist-packages/nbxmpp/transports_nb.py", line 690, in _on_receive
    self.on_receive(data)
  File "/usr/lib/python3/dist-packages/nbxmpp/dispatcher_nb.py", line 238, in ProcessNonBlocking
    self._owner.Connection.disconnect()
AttributeError: 'NoneType' object has no attribute 'Connection'

Steps to reproduce the problem

... It was idling. Didn't do nothing and disconnected from the internet (don't know why) and after 15-20 minutes later the error occurred.