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java.lang.NullPointerException at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:765) at org.jivesoftware.openfire.muc.spi.MultiUserChatServerImpl.getChatRoom(MultiUserChatServerImpl.java:457) at org.jivesoftware.openfire.muc.spi.IQMUCRegisterHandler.handleIQ(IQMUCRegisterHandler.java:109) at org.jivesoftware.openfire.muc.spi.MultiUserChatServerImpl.process(MultiUserChatServerImpl.java:264) at org.jivesoftware.openfire.muc.spi.MultiUserChatServerImpl.processPacket(MultiUserChatServerImpl.java:229) at org.jivesoftware.openfire.muc.spi.MultiUserChatServerImpl.process(MultiUserChatServerImpl.java:216) at org.jivesoftware.openfire.IQRouter.handle(IQRouter.java:250) at org.jivesoftware.openfire.IQRouter.route(IQRouter.java:104) at org.jivesoftware.openfire.spi.PacketRouterImpl.route(PacketRouterImpl.java:67) at org.jivesoftware.openfire.net.SocketReader.processIQ(SocketReader.java:243) at org.jivesoftware.openfire.net.ServerSocketReader.access$001(ServerSocketReader.java:46) at org.jivesoftware.openfire.net.ServerSocketReader$1.run(ServerSocketReader.java:79) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907) at java.lang.Thread.run(Thread.java:619)