java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.jivesoftware.messenger.SessionManager.changePriority(SessionManager.java:524)
at org.jivesoftware.messenger.ClientSession.setPresence(ClientSession.java:339)
at org.jivesoftware.messenger.handler.PresenceUpdateHandler.process(PresenceUpdateHandler.java:111)
at org.jivesoftware.messenger.handler.PresenceUpdateHandler.process(PresenceUpdateHandler.java:151)
at org.jivesoftware.messenger.PresenceRouter.handle(PresenceRouter.java:86)
at org.jivesoftware.messenger.PresenceRouter.route(PresenceRouter.java:59)
at org.jivesoftware.messenger.PacketRouter.route(PacketRouter.java:73)
at org.jivesoftware.messenger.net.SocketReadThread.run(SocketReadThread.java:128)

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