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Versions

• OS: Arch Linux
• GTK Version: 3.24.24
• PyGObject Version: 3.38.0
• GLib Version : 2.66.2
• python-nbxmpp Version: 2.0.1
• Gajim Version: 1.3.0

Traceback

Traceback (most recent call last):
  File "/usr/lib/python3.9/site-packages/gajim/gtk/settings.py", line 396, in on_switch
    self.set_value(value)
  File "/usr/lib/python3.9/site-packages/gajim/gtk/settings.py", line 311, in set_value
    self.callback(state, self.data)
  File "/usr/lib/python3.9/site-packages/gajim/gtk/preferences.py", line 960, in _toggle_live_preview
    preview.toggle_preview(value)
  File "/usr/lib/python3.9/site-packages/gajim/gtk/video_preview.py", line 58, in toggle_preview
    return self._disable_preview()
  File "/usr/lib/python3.9/site-packages/gajim/gtk/video_preview.py", line 102, in _disable_preview
    self._av_pipeline.remove(self._av_src)
AttributeError: 'NoneType' object has no attribute 'remove'

Steps to reproduce the problem

Enable and then disable the Live Video Preview for the AV Chat in the settings menu.