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

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at org.jivesoftware.messenger.SessionManager.changePriority(
at org.jivesoftware.messenger.ClientSession.setPresence(
at org.jivesoftware.messenger.handler.PresenceUpdateHandler.process(
at org.jivesoftware.messenger.handler.PresenceUpdateHandler.process(
at org.jivesoftware.messenger.PresenceRouter.handle(
at org.jivesoftware.messenger.PresenceRouter.route(
at org.jivesoftware.messenger.PacketRouter.route(

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