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

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java.lang.NullPointerException:
at org.jivesoftware.openfire.SessionManager.changePriority(SessionManager.java:923)
at org.jivesoftware.openfire.session.ClientSession.setPresence(ClientSession.java:638)
at org.jivesoftware.openfire.handler.PresenceUpdateHandler.process(PresenceUpdateHandler.java:102)
at org.jivesoftware.openfire.handler.PresenceUpdateHandler.process(PresenceUpdateHandler.java:88)
at org.jivesoftware.openfire.handler.PresenceUpdateHandler.process(PresenceUpdateHandler.java:151)
at org.jivesoftware.openfire.PresenceRouter.handle(PresenceRouter.java:123)
at org.jivesoftware.openfire.PresenceRouter.route(PresenceRouter.java:69)

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