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java.lang.IllegalStateException: Entry was removed	at java.util.concurrent.ConcurrentHashMap$EntryIterator.getKey(Unknown Source)	at org.jivesoftware.messenger.user.User$PropertiesEntrySet$1.remove(User.java:355)	at java.util.AbstractMap.remove(Unknown Source)	at org.jivesoftware.messenger.spi.PresenceManagerImpl.deleteLastUnavailablePresence(PresenceManagerImpl.java:179)	at org.jivesoftware.messenger.handler.PresenceUpdateHandler.process(PresenceUpdateHandler.java:103)	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)