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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:207)	at net.minecraft.server.v1_10_R1.EntityPlayer.F(EntityPlayer.java:1107)	at net.minecraft.server.v1_10_R1.EntityLiving.tickPotionEffects(EntityLiving.java:554)	at net.citizensnpcs.npc.entity.EntityHumanNPC.m(EntityHumanNPC.java:283)	at net.minecraft.server.v1_10_R1.World.entityJoinedWorld(World.java:1629)	at net.minecraft.server.v1_10_R1.World.g(World.java:1604)	at net.citizensnpcs.util.PlayerUpdateTask.run(PlayerUpdateTask.java:51)	at org.bukkit.craftbukkit.v1_10_R1.scheduler.CraftTask.run(CraftTask.java:71)	at org.bukkit.craftbukkit.v1_10_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350)	at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:723)	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)