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java.lang.NullPointerException: 	at java.util.ArrayList.addAll(ArrayList.java:473)	at org.jivesoftware.wildfire.muc.spi.IQOwnerHandler.handleItemsElement(IQOwnerHandler.java:261)	at org.jivesoftware.wildfire.muc.spi.IQOwnerHandler.handleIQ(IQOwnerHandler.java:98)	at org.jivesoftware.wildfire.muc.spi.MUCUserImpl.process(MUCUserImpl.java:344)	at org.jivesoftware.wildfire.muc.spi.MUCUserImpl.process(MUCUserImpl.java:127)	at org.jivesoftware.wildfire.muc.spi.MultiUserChatServerImpl.processPacket(MultiUserChatServerImpl.java:235)	at org.jivesoftware.wildfire.muc.spi.MultiUserChatServerImpl.process(MultiUserChatServerImpl.java:216)	at org.jivesoftware.wildfire.IQRouter.handle(IQRouter.java:218)	at org.jivesoftware.wildfire.IQRouter.route(IQRouter.java:96)	at org.jivesoftware.wildfire.spi.PacketRouterImpl.route(PacketRouterImpl.java:67)	at org.jivesoftware.wildfire.net.SocketReader.processIQ(SocketReader.java:250)	at org.jivesoftware.wildfire.net.ClientSocketReader.processIQ(ClientSocketReader.java:51)	at org.jivesoftware.wildfire.net.SocketReader.process(SocketReader.java:216)	at org.jivesoftware.wildfire.net.BlockingReadingMode.readStream(BlockingReadingMode.java:156)	at org.jivesoftware.wildfire.net.BlockingReadingMode.run(BlockingReadingMode.java:62)	at org.jivesoftware.wildfire.net.SocketReader.run(SocketReader.java:123)	at java.lang.Thread.run(Thread.java:595)