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java.util.ConcurrentModificationException: 	at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:617)	at java.util.LinkedList$ListItr.remove(LinkedList.java:585)	at org.jivesoftware.messenger.muc.HistoryStrategy.addMessage(HistoryStrategy.java:175)	at org.jivesoftware.messenger.muc.MUCRoomHistory.addMessage(MUCRoomHistory.java:105)	at org.jivesoftware.messenger.muc.spi.MUCRoomImpl.send(MUCRoomImpl.java:767)	at org.jivesoftware.messenger.muc.spi.MUCRoomImpl.sendPublicMessage(MUCRoomImpl.java:750)	at org.jivesoftware.messenger.muc.spi.MUCUserImpl.process(MUCUserImpl.java:214)	at org.jivesoftware.messenger.muc.spi.MUCUserImpl.process(MUCUserImpl.java:120)	at org.jivesoftware.messenger.muc.spi.MultiUserChatServerImpl.processPacket(MultiUserChatServerImpl.java:200)	at org.jivesoftware.messenger.muc.spi.MultiUserChatServerImpl.process(MultiUserChatServerImpl.java:184)	at org.jivesoftware.messenger.MessageRouter.route(MessageRouter.java:80)	at org.jivesoftware.messenger.PacketRouter.route(PacketRouter.java:69)	at org.jivesoftware.messenger.net.SocketReader.processMessage(SocketReader.java:416)	at org.jivesoftware.messenger.net.ClientSocketReader.processMessage(ClientSocketReader.java:63)	at org.jivesoftware.messenger.net.SocketReader.readStream(SocketReader.java:190)	at org.jivesoftware.messenger.net.SocketReader.run(SocketReader.java:115)	at java.lang.Thread.run(Thread.java:595)