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java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry(Unknown Source) at java.util.HashMap$KeyIterator.next(Unknown Source) at org.jivesoftware.messenger.handler.PresenceUpdateHandler.broadcastUnavailableForDirectedPresences(PresenceUpdateHandler.java:396) at org.jivesoftware.messenger.handler.PresenceUpdateHandler.process(PresenceUpdateHandler.java:108) at org.jivesoftware.messenger.handler.PresenceUpdateHandler.process(PresenceUpdateHandler.java:150) at org.jivesoftware.messenger.SessionManager$ClientSessionListener.onConnectionClose(SessionManager.java:1026) at org.jivesoftware.messenger.net.SocketConnection.notifyCloseListeners(SocketConnection.java:278) at org.jivesoftware.messenger.net.SocketConnection.close(SocketConnection.java:224) at org.jivesoftware.messenger.net.SocketConnection.deliver(SocketConnection.java:252) at org.jivesoftware.messenger.ClientSession.deliver(ClientSession.java:373) at org.jivesoftware.messenger.ClientSession.process(ClientSession.java:367) at org.jivesoftware.messenger.SessionManager.broadcastPresenceToOtherResource(SessionManager.java:446) at org.jivesoftware.messenger.SessionManager.sessionAvailable(SessionManager.java:411) at org.jivesoftware.messenger.ClientSession.setPresence(ClientSession.java:335) at org.jivesoftware.messenger.handler.PresenceUpdateHandler.process(PresenceUpdateHandler.java:93) at org.jivesoftware.messenger.handler.PresenceUpdateHandler.process(PresenceUpdateHandler.java:150) at org.jivesoftware.messenger.PresenceRouter.handle(PresenceRouter.java:86) at org.jivesoftware.messenger.PresenceRouter.route(PresenceRouter.java:59) at org.jivesoftware.messenger.PacketRouter.route(PacketRouter.java:73) at org.jivesoftware.messenger.net.SocketReadThread.readStream(SocketReadThread.java:240) at org.jivesoftware.messenger.net.SocketReadThread.run(SocketReadThread.java:105)