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

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java.lang.NullPointerException:
at net.sf.kraken.protocols.xmpp.XMPPListener.processMessage(XMPPListener.java:97)
at org.jivesoftware.smack.Chat.deliver(Chat.java:169)
at org.jivesoftware.smack.ChatManager.deliverMessage(ChatManager.java:221)
at org.jivesoftware.smack.ChatManager.access$200(ChatManager.java:42)
at org.jivesoftware.smack.ChatManager$2.processPacket(ChatManager.java:118)
at org.jivesoftware.smack.PacketReader$ListenerWrapper.notifyListener(PacketReader.java:819)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)

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