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java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextNode(HashMap.java:1437)[?:1.8.0_101] at java.util.HashMap$KeyIterator.next(HashMap.java:1461)[?:1.8.0_101] at net.minecraft.server.v1_10_R1.EntityTracker.a(EntityTracker.java:253)[spigot-1.10.2.jar:git-Spigot-1e4dd71-5e5cf84] at net.minecraft.server.v1_10_R1.PlayerChunk.b(PlayerChunk.java:138)[spigot-1.10.2.jar:git-Spigot-1e4dd71-5e5cf84] at net.minecraft.server.v1_10_R1.PlayerChunkMap.flush(PlayerChunkMap.java:188)[spigot-1.10.2.jar:git-Spigot-1e4dd71-5e5cf84] at net.minecraft.server.v1_10_R1.WorldServer.doTick(WorldServer.java:257)[spigot-1.10.2.jar:git-Spigot-1e4dd71-5e5cf84] at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:783)[spigot-1.10.2.jar:git-Spigot-1e4dd71-5e5cf84] at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:400)[spigot-1.10.2.jar:git-Spigot-1e4dd71-5e5cf84] at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:668)[spigot-1.10.2.jar:git-Spigot-1e4dd71-5e5cf84] at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:567)[spigot-1.10.2.jar:git-Spigot-1e4dd71-5e5cf84] at java.lang.Thread.run(Thread.java:745)[?:1.8.0_101]