Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/papyon/client.py", line 330, in property_changed
    self._dispatch(method_name, contact)
  File "/usr/lib/pymodules/python2.6/papyon/event/__init__.py", line 44, in _dispatch
    if event_handler._dispatch_event(name, *args):
  File "/usr/lib/pymodules/python2.6/papyon/event/__init__.py", line 65, in _dispatch_event
    handler(*params)
  File "/usr/lib/python2.6/dist-packages/butterfly/channel/media.py", line 223, in on_contact_presence_changed
    self.Close()
  File "/usr/lib/python2.6/dist-packages/butterfly/channel/media.py", line 110, in Close
    self._call.end()
  File "/usr/lib/pymodules/python2.6/papyon/sip/call.py", line 340, in end
    if self._state in ("INCOMING"):
TypeError: 'in <string>' requires string as left operand, not NoneType