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java.lang.NullPointerException: 	at org.dom4j.tree.AbstractBranch.appendContent(AbstractBranch.java:290)	at org.dom4j.tree.AbstractElement.createCopy(AbstractElement.java:1275)	at org.xmpp.packet.Presence.(Presence.java:85)	at org.xmpp.packet.Presence.createCopy(Presence.java:309)	at org.jivesoftware.openfire.muc.spi.LocalMUCRoom.presenceUpdated(LocalMUCRoom.java:1814)	at org.jivesoftware.openfire.muc.spi.LocalMUCUser.process(LocalMUCUser.java:566)	at org.jivesoftware.openfire.muc.spi.LocalMUCUser.process(LocalMUCUser.java:197)	at org.jivesoftware.openfire.muc.spi.MultiUserChatServiceImpl.processPacket(MultiUserChatServiceImpl.java:331)	at org.jivesoftware.openfire.component.InternalComponentManager$RoutableComponents.process(InternalComponentManager.java:591)	at org.jivesoftware.openfire.spi.RoutingTableImpl.routeToComponent(RoutingTableImpl.java:401)	at org.jivesoftware.openfire.spi.RoutingTableImpl.routePacket(RoutingTableImpl.java:243)	at org.jivesoftware.openfire.PresenceRouter.handle(PresenceRouter.java:135)	at org.jivesoftware.openfire.PresenceRouter.route(PresenceRouter.java:84)	at org.jivesoftware.openfire.spi.PacketRouterImpl.route(PacketRouterImpl.java:84)	at org.jivesoftware.openfire.net.SocketReader.processPresence(SocketReader.java:284)	at org.jivesoftware.openfire.net.ServerSocketReader.access$201(ServerSocketReader.java:60)	at org.jivesoftware.openfire.net.ServerSocketReader$2.run(ServerSocketReader.java:122)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)