this report has been filed here: https://bugs.edge.launchpad.net/ubuntu/+source/telepathy-butterfly/+bug/629501 it seems to be a random crash, not sure how to reproduce it. Here's the traceback: Traceback (most recent call last): File "/usr/lib/pymodules/python2.6/papyon/switchboard_manager.py", line 366, in _sb_message_received handler._on_message_received(message) File "/usr/lib/pymodules/python2.6/papyon/msnp2p/transport/switchboard.py", line 116, in _on_message_received self._on_chunk_received(self._peer, self._peer_guid, chunk) File "/usr/lib/pymodules/python2.6/papyon/msnp2p/transport/base.py", line 157, in _on_chunk_received self.__send_chunk(peer, peer_guid, ack_chunk) File "/usr/lib/pymodules/python2.6/papyon/msnp2p/transport/base.py", line 224, in __send_chunk self._send_chunk(peer, peer_guid, chunk) File "/usr/lib/pymodules/python2.6/papyon/msnp2p/transport/switchboard.py", line 98, in _send_chunk peer_guid + "}"} TypeError: cannot concatenate 'str' and 'NoneType' objects
*** This bug has been marked as a duplicate of bug 29967 ***
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