ZeitgeistListener tracebacks on AQ_CREATE_SHARE_OK

When creating a share using u1sdtool --offer_share with a username instead of email, I got this traceback:

2011-01-26 13:27:24,274 - ubuntuone.SyncDaemon.EQ - ERROR - Error encountered while handling: AQ_CREATE_SHARE_OK in <ubuntuone.eventlog.zg_listener.ZeitgeistListener object at 0x2c54890>
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/ubuntuone/syncdaemon/event_queue.py", line 298, in _dispatch
    try:
  File "/usr/lib/pymodules/python2.6/ubuntuone/eventlog/zg_listener.py", line 61, in handle_AQ_CREATE_SHARE_OK
    share = self.vm.shared[share_id]
  File "/usr/lib/pymodules/python2.6/ubuntuone/syncdaemon/volume_manager.py", line 1428, in __getitem__
    return super(VMTritcaskShelf, self).__getitem__(self._get_key(key))
  File "/usr/lib/pymodules/python2.6/ubuntuone/syncdaemon/tritcask.py", line 793, in __getitem__
    return self._deserialize(self._db.get(self.row_type, key))
  File "/usr/lib/pymodules/python2.6/ubuntuone/syncdaemon/tritcask.py", line 707, in get
    raise ValueError('key must be a str instance.')
ValueError: key must be a str instance.