DBus connection error: AttributeError: 'NoneType' object has no attribute 'unpack'

Version: 1.58.0+2+g1f1dd7f4-2

OS: Arch Linux x64

Error:

GLib-GIO-CRITICAL **: 16:54:19.247: g_dbus_connection_call_sync_internal: assertion 'G_IS_DBUS_CONNECTION (connection)' failed
Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/gi/overrides/Gio.py", line 296, in __call__
    return self._unpack_result(result)
  File "/usr/lib/python3.7/site-packages/gi/overrides/Gio.py", line 302, in _unpack_result
    result = result.unpack()
AttributeError: 'NoneType' object has no attribute 'unpack'