Saving URI crashes playlists

[Cthol]

Starting from a sane state, I click "play a uri", enter "http://www.tv-radio.com/station/fip_mp3/fip_mp3-128k.m3u", play it. Everything is OK so far.
Now I click the "Save playlist" button and I get the expected playlist.
I stop and restart Listen and all my playlists are gone.
I have to delete ".config/listen/playlist*" files to get a working player back.
Obviously, there's something wrong with saving M3U URI as one can see on the attached GHex screenshot.
Restarting Listen in debugging mode shows (expectedly):
Traceback (most recent call last):
  File "/usr/lib/listen/source/__init__.py", line 260, in __on_db_loaded
    items = [ (pl.name, self._source_item_klass(pl)) for pl in ListenDB.get_playlists(self._type) ]
  File "/usr/lib/listen/source/__init__.py", line 133, in __init__
    self.widget = ScrolledWindow(self._playlist_songview("playlist", pl))
  File "/usr/lib/listen/widget/song_view.py", line 380, in __init__
    self.get_model().fill(pl.get_songs())
  File "/usr/lib/listen/library.py", line 1331, in get_songs
    return ListenDB.get_songs_from_uris(self.__uris)
  File "/usr/lib/listen/library.py", line 596, in get_songs_from_uris
    return [ self.__songs[vfs.realuri(uri)] for uri in uris ]
KeyError: 'http://www.tv-radio.com/station/fip_mp3/fip_mp3-128k.m3u'

Same things happen with "http://mp3.live.tv-radio.com/fip/all/fiphautdebit.mp3" uri.

Listen is 0.6.5, Ubuntu is 11.04, Gstreamer is 0.10.32, Python is 2.7.1.