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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)