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java.lang.NullPointerException: 	at java.util.concurrent.ConcurrentHashMap.hash(Unknown Source)	at java.util.concurrent.ConcurrentHashMap.get(Unknown Source)	at org.jivesoftware.messenger.SessionManager$SessionMap.sortSession(SessionManager.java:155)	at org.jivesoftware.messenger.SessionManager$SessionMap.addSession(SessionManager.java:141)	at org.jivesoftware.messenger.SessionManager.addSession(SessionManager.java:366)	at org.jivesoftware.messenger.ClientSession.setAuthToken(ClientSession.java:259)	at org.jivesoftware.messenger.handler.IQAuthHandler.login(IQAuthHandler.java:227)	at org.jivesoftware.messenger.handler.IQAuthHandler.handleIQ(IQAuthHandler.java:140)	at org.jivesoftware.messenger.handler.IQHandler.process(IQHandler.java:48)	at org.jivesoftware.messenger.IQRouter.handle(IQRouter.java:202)	at org.jivesoftware.messenger.IQRouter.route(IQRouter.java:73)	at org.jivesoftware.messenger.PacketRouter.route(PacketRouter.java:65)	at org.jivesoftware.messenger.net.SocketReadThread.readStream(SocketReadThread.java:285)	at org.jivesoftware.messenger.net.SocketReadThread.run(SocketReadThread.java:105)