tulir: tbh having the same issue on FB this is the full trace:

~$ sudo docker start mautrix-facebook -a
Traceback (most recent call last):
  File "/usr/lib/python3.8/runpy.py", line 194, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/lib/python3.8/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "/usr/lib/python3.8/site-packages/mautrix_facebook/__main__.py", line 171, in <module>
    MessengerBridge().run()
  File "/usr/lib/python3.8/site-packages/mautrix/util/program.py", line 83, in run
    self._prepare()
  File "/usr/lib/python3.8/site-packages/mautrix/util/program.py", line 89, in _prepare
    self.preinit()
  File "/usr/lib/python3.8/site-packages/mautrix/bridge/bridge.py", line 75, in preinit
    super().preinit()
  File "/usr/lib/python3.8/site-packages/mautrix/util/program.py", line 109, in preinit
    self.prepare_config()
  File "/usr/lib/python3.8/site-packages/mautrix/bridge/bridge.py", line 91, in prepare_config
    self.load_and_update_config()
  File "/usr/lib/python3.8/site-packages/mautrix/util/program.py", line 133, in load_and_update_config
    self.config.update(save=not self.args.no_update)
  File "/usr/lib/python3.8/site-packages/mautrix/util/config/base.py", line 66, in update
    self.do_update(ConfigUpdateHelper(base, self))
  File "/usr/lib/python3.8/site-packages/mautrix_facebook/config.py", line 42, in do_update
    super().do_update(helper)
  File "/usr/lib/python3.8/site-packages/mautrix/bridge/config.py", line 55, in do_update
    copy("homeserver.address")
  File "/usr/lib/python3.8/site-packages/mautrix/util/config/base.py", line 26, in copy
    if from_path in self.source:
  File "/usr/lib/python3.8/site-packages/mautrix/util/config/recursive_dict.py", line 52, in __contains__
    return self.get(key, None) is not None
  File "/usr/lib/python3.8/site-packages/mautrix/util/config/recursive_dict.py", line 45, in get
    return self._recursive_get(self._data, key, default_value)
  File "/usr/lib/python3.8/site-packages/mautrix/util/config/recursive_dict.py", line 36, in _recursive_get
    next_data = data.get(key, self._dict_factory())
AttributeError: 'NoneType' object has no attribute 'get'

• a780d305 Remove SerializableAttrs type param