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

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java.lang.NullPointerException:
at java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:846)
at org.jivesoftware.messenger.muc.spi.MUCRoomImpl.nicknameChanged(MUCRoomImpl.java:1250)
at org.jivesoftware.messenger.muc.spi.MUCUserImpl.process(MUCUserImpl.java:461)
at org.jivesoftware.messenger.muc.spi.MUCUserImpl.process(MUCUserImpl.java:115)
at org.jivesoftware.messenger.muc.spi.MultiUserChatServerImpl.processPacket(MultiUserChatServerImpl.java:207)
at org.jivesoftware.messenger.muc.spi.MultiUserChatServerImpl.process(MultiUserChatServerImpl.java:191)
at org.jivesoftware.messenger.PresenceRouter.handle(PresenceRouter.java:91)
at org.jivesoftware.messenger.PresenceRouter.route(PresenceRouter.java:59)
at org.jivesoftware.messenger.PacketRouter.route(PacketRouter.java:73)
at org.jivesoftware.messenger.net.SocketReadThread.readStream(SocketReadThread.java:204)
at org.jivesoftware.messenger.net.SocketReadThread.run(SocketReadThread.java:113)

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