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

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java.lang.NullPointerException:
at org.jivesoftware.wildfire.handler.IQRosterHandler.manageRoster(IQRosterHandler.java:172)
at org.jivesoftware.wildfire.handler.IQRosterHandler.handleIQ(IQRosterHandler.java:103)
at org.jivesoftware.wildfire.handler.IQHandler.process(IQHandler.java:48)
at org.jivesoftware.wildfire.IQRouter.handle(IQRouter.java:256)
at org.jivesoftware.wildfire.IQRouter.route(IQRouter.java:79)
at org.jivesoftware.wildfire.PacketRouter.route(PacketRouter.java:65)
at org.jivesoftware.wildfire.net.SocketReader.processIQ(SocketReader.java:395)
at org.jivesoftware.wildfire.net.ClientSocketReader.processIQ(ClientSocketReader.java:50)
at org.jivesoftware.wildfire.net.SocketReader.readStream(SocketReader.java:263)
at org.jivesoftware.wildfire.net.SocketReader.run(SocketReader.java:119)
at java.lang.Thread.run(Thread.java:595)

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