Bad friend parse in Yahoo transport

Some sort of items on folk's friends lists are causing exceptions:
[org.jivesoftware.wildfire.gateway.protocols.yahoo.YahooSessionListener.inputExceptionThrown(YahooSessionListener.java:191)] Input error from yahoo: Source: InputThread
ymsg.network.YMSG9BadFormatException: Bad parse of online friends in logon packet
at ymsg.network.Session.receiveLogon(Unknown Source)
at ymsg.network.Session$InputThread.process(Unknown Source)
at ymsg.network.Session$InputThread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at java.util.Hashtable.get(Hashtable.java:336)
at ymsg.network.UserStore.get(Unknown Source)
at ymsg.network.Session.updateFriendsStatus(Unknown Source)
... 3 more

I'm hoping to catch someone who actually is seeing this to find out who's on their friends list and which ones might be causing the problem. I have a theory that it's MSN contacts, but not sure yet.