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via GitHub by alekso56
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net.minecraft.server.v1_10_R1.ReportedException: Ticking player at net.citizensnpcs.util.PlayerUpdateTask.run(PlayerUpdateTask.java:57)[?:?] at org.bukkit.craftbukkit.v1_10_R1.scheduler.CraftTask.run(CraftTask.java:71)[spigot-1.10.2.jar:git-Spigot-1e4dd71-5e5cf84] at org.bukkit.craftbukkit.v1_10_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350)[spigot-1.10.2.jar:git-Spigot-1e4dd71-5e5cf84] at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:723)[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]Caused by: 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:207)[spigot-1.10.2.jar:git-Spigot-1e4dd71-5e5cf84] at net.minecraft.server.v1_10_R1.EntityPlayer.F(EntityPlayer.java:1107)[spigot-1.10.2.jar:git-Spigot-1e4dd71-5e5cf84] at net.minecraft.server.v1_10_R1.EntityLiving.tickPotionEffects(EntityLiving.java:554)[spigot-1.10.2.jar:git-Spigot-1e4dd71-5e5cf84] at net.citizensnpcs.npc.entity.EntityHumanNPC.m(EntityHumanNPC.java:283)[?:?] at net.minecraft.server.v1_10_R1.World.entityJoinedWorld(World.java:1629)[spigot-1.10.2.jar:git-Spigot-1e4dd71-5e5cf84] at net.minecraft.server.v1_10_R1.World.g(World.java:1604)[spigot-1.10.2.jar:git-Spigot-1e4dd71-5e5cf84] at net.citizensnpcs.util.PlayerUpdateTask.run(PlayerUpdateTask.java:51)[?:?] ... 7 more