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java.util.ConcurrentModificationException: 	at java.util.HashMap$HashIterator.remove(HashMap.java:1443)	at vg.civcraft.mc.bettershards.bungee.ServerHandler$1.run(ServerHandler.java:68)	at net.md_5.bungee.scheduler.BungeeTask.run(BungeeTask.java:63)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)