The meaning of this error message in mopidy.log?

Pi MusicBox
1 
2015-04-10 15:18:12,927 - ERROR    Unhandled exception in MpdSession (urn:uuid:a17c6800-96c6-4404-a94e-5ceb9c934b71):
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/pykka/actor.py", line 200, in _actor_loop
    response = self._handle_receive(message)
  File "/usr/lib/python2.7/dist-packages/pykka/actor.py", line 303, in _handle_receive
    return self.on_receive(message)
  File "/usr/local/lib/python2.7/dist-packages/mopidy/utils/network.py", line 366, in on_receive
    self.on_line_received(line)
  File "/usr/local/lib/python2.7/dist-packages/mopidy/mpd/session.py", line 33, in on_line_received
    response = self.dispatcher.handle_request(line)
  File "/usr/local/lib/python2.7/dist-packages/mopidy/mpd/dispatcher.py", line 46, in handle_request
    return self._call_next_filter(request, response, filter_chain)
  File "/usr/local/lib/python2.7/dist-packages/mopidy/mpd/dispatcher.py", line 67, in _call_next_filter
    return next_filter(request, response, filter_chain)
  File "/usr/local/lib/python2.7/dist-packages/mopidy/mpd/dispatcher.py", line 75, in _catch_mpd_ack_errors_filter
    return self._call_next_filter(request, response, filter_chain)
  File "/usr/local/lib/python2.7/dist-packages/mopidy/mpd/dispatcher.py", line 67, in _call_next_filter
    return next_filter(request, response, filter_chain)
  File "/usr/local/lib/python2.7/dist-packages/mopidy/mpd/dispatcher.py", line 85, in _authenticate_filter
    return self._call_next_filter(request, response, filter_chain)
  File "/usr/local/lib/python2.7/dist-packages/mopidy/mpd/dispatcher.py", line 67, in _call_next_filter
    return next_filter(request, response, filter_chain)
  File "/usr/local/lib/python2.7/dist-packages/mopidy/mpd/dispatcher.py", line 104, in _command_list_filter
    response = self._call_next_filter(request, response, filter_chain)
  File "/usr/local/lib/python2.7/dist-packages/mopidy/mpd/dispatcher.py", line 67, in _call_next_filter
    return next_filter(request, response, filter_chain)
  File "/usr/local/lib/python2.7/dist-packages/mopidy/mpd/dispatcher.py", line 133, in _idle_filter
    response = self._call_next_filter(request, response, filter_chain)
  File "/usr/local/lib/python2.7/dist-packages/mopidy/mpd/dispatcher.py", line 67, in _call_next_filter
    return next_filter(request, response, filter_chain)
  File "/usr/local/lib/python2.7/dist-packages/mopidy/mpd/dispatcher.py", line 146, in _add_ok_filter
    response = self._call_next_filter(request, response, filter_chain)
  File "/usr/local/lib/python2.7/dist-packages/mopidy/mpd/dispatcher.py", line 67, in _call_next_filter
    return next_filter(request, response, filter_chain)
  File "/usr/local/lib/python2.7/dist-packages/mopidy/mpd/dispatcher.py", line 158, in _call_handler_filter
    response = self._format_response(self._call_handler(request))
  File "/usr/local/lib/python2.7/dist-packages/mopidy/mpd/dispatcher.py", line 167, in _call_handler
    return protocol.commands.call(tokens, context=self.context)
  File "/usr/local/lib/python2.7/dist-packages/mopidy/mpd/protocol/__init__.py", line 178, in call
    return self.handlers[tokens[0]](context, *tokens[1:])
  File "/usr/local/lib/python2.7/dist-packages/mopidy/mpd/protocol/__init__.py", line 156, in validate
    return func(**callargs)
  File "/usr/local/lib/python2.7/dist-packages/mopidy/mpd/protocol/current_playlist.py", line 240, in playlistinfo
    return translator.tracks_to_mpd_format(tl_tracks, start, end)
  File "/usr/local/lib/python2.7/dist-packages/mopidy/mpd/translator.py", line 124, in tracks_to_mpd_format
    result.append(track_to_mpd_format(track, position))
  File "/usr/local/lib/python2.7/dist-packages/mopidy/mpd/translator.py", line 41, in track_to_mpd_format
    ('Album', track.album and track.album.name or ''),
AttributeError: 'dict' object has no attribute 'name'
2

Some code has managed to sneak a dictionary into a model where there should have been an other model instance. Likely cause is a misbehaving frontend / JS client.