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java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429) at java.util.HashMap$KeyIterator.next(HashMap.java:1453) at net.minecraft.entity.EntityTracker.func_72788_a(EntityTracker.java:280) at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:721) at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613) at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:240) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471) at java.lang.Thread.run(Thread.java:745)