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java.lang.IllegalArgumentException: Argument cannot be null.	at org.xmpp.packet.JID.getParts(JID.java:568)	at org.xmpp.packet.JID.(JID.java:476)	at org.jivesoftware.openfire.muc.spi.IQOwnerHandler.handleIQ(IQOwnerHandler.java:125)	at org.jivesoftware.openfire.muc.spi.LocalMUCUser.process(LocalMUCUser.java:413)	at org.jivesoftware.openfire.muc.spi.LocalMUCUser.process(LocalMUCUser.java:191)	at org.jivesoftware.openfire.muc.spi.MultiUserChatServiceImpl.processPacket(MultiUserChatServiceImpl.java:321)	at org.jivesoftware.openfire.component.InternalComponentManager$RoutableComponents.process(InternalComponentManager.java:587)	at org.jivesoftware.openfire.spi.RoutingTableImpl.routeToComponent(RoutingTableImpl.java:356)	at org.jivesoftware.openfire.spi.RoutingTableImpl.routePacket(RoutingTableImpl.java:238)	at org.jivesoftware.openfire.IQRouter.handle(IQRouter.java:324)	at org.jivesoftware.openfire.IQRouter.route(IQRouter.java:121)	at org.jivesoftware.openfire.spi.PacketRouterImpl.route(PacketRouterImpl.java:76)	at org.jivesoftware.openfire.spi.PacketRouterImpl.route(PacketRouterImpl.java:68)	at org.jivesoftware.openfire.component.InternalComponentManager.sendPacket(InternalComponentManager.java:281)	at org.jivesoftware.xmpp.workgroup.WorkgroupManager.send(WorkgroupManager.java:862)	at org.jivesoftware.xmpp.workgroup.Workgroup.send(Workgroup.java:442)	at org.jivesoftware.xmpp.workgroup.Workgroup.destroyGroupChatRoom(Workgroup.java:1723)	at org.jivesoftware.xmpp.workgroup.Workgroup.destroy(Workgroup.java:1710)	at org.jivesoftware.xmpp.workgroup.WorkgroupManager.deleteWorkgroup(WorkgroupManager.java:386)	at org.jivesoftware.openfire.plugin.fastpath.workgroup_002ddelete_jsp._jspService(workgroup_002ddelete_jsp.java:67)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.jivesoftware.openfire.container.PluginServlet.handleJSP(PluginServlet.java:247)	at org.jivesoftware.openfire.container.PluginServlet.service(PluginServlet.java:105)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:547)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1359)	at org.jivesoftware.admin.PluginFilter.doFilter(PluginFilter.java:78)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1330)	at org.jivesoftware.admin.AuthCheckFilter.doFilter(AuthCheckFilter.java:164)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1330)	at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:118)	at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:52)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1330)	at org.jivesoftware.util.LocaleFilter.doFilter(LocaleFilter.java:74)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1330)	at org.jivesoftware.util.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:50)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1330)	at org.jivesoftware.admin.PluginFilter.doFilter(PluginFilter.java:78)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1330)	at org.jivesoftware.admin.AuthCheckFilter.doFilter(AuthCheckFilter.java:164)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1330)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:478)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:520)	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:227)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:941)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:409)	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:186)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:875)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:250)	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:149)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:110)	at org.eclipse.jetty.server.Server.handle(Server.java:349)	at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:441)	at org.eclipse.jetty.server.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:919)	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:582)	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:218)	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:51)	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:586)	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:44)	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:598)	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:533)	at java.lang.Thread.run(Thread.java:662)