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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.<init>(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)