Traceback (most recent call last):
  File "/home/phw/devel/musicbrainz/picard/./picard/webservice/__init__.py", line 572, in _process_reply
    self._handle_reply(reply, request)
  File "/home/phw/devel/musicbrainz/picard/./picard/webservice/__init__.py", line 559, in _handle_reply
    handler(document, reply, error)
  File "/home/phw/devel/musicbrainz/picard/./picard/oauth.py", line 271, in on_fetch_username_finished
    callback(successful=successful, error_msg=error_msg)
  File "/home/phw/devel/musicbrainz/picard/./picard/tagger.py", line 354, in on_mb_login_finished
    callback(successful, error_msg)
  File "/home/phw/devel/musicbrainz/picard/./picard/ui/options/general.py", line 162, in on_login_finished
    self.update_login_logout(error_msg)
  File "/home/phw/devel/musicbrainz/picard/./picard/ui/options/general.py", line 137, in update_login_logout
    self.ui.logged_in.setText(_("Logged in as <b>%s</b>.") % config.persist["oauth_username"])
RuntimeError: wrapped C/C++ object of type QLabel has been deleted