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Ticking entity
java.util.ConcurrentModificationException: 	at java.util.HashMap$HashIterator.nextNode(HashMap.java:1437)	at java.util.HashMap$KeyIterator.next(HashMap.java:1461)	at net.minecraft.server.v1_10_R1.EntityTracker.a(EntityTracker.java:253)	at net.minecraft.server.v1_10_R1.PlayerChunk.b(PlayerChunk.java:138)	at net.minecraft.server.v1_10_R1.PlayerChunkMap.flush(PlayerChunkMap.java:188)	at net.minecraft.server.v1_10_R1.WorldServer.doTick(WorldServer.java:257)	at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:783)	at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:400)	at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:668)	at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:567)	at java.lang.Thread.run(Thread.java:745)