[17:19:35 ERROR]: Entity threw exception at TDM:98.41754015038667,4.0,-12.494196827897659
java.util.ConcurrentModificationException: null
	at java.util.LinkedHashMap$LinkedHashIterator.nextNode(LinkedHashMap.java:758) ~[?:?]
	at java.util.LinkedHashMap$LinkedKeyIterator.next(LinkedHashMap.java:780) ~[?:?]
	at net.minecraft.world.entity.ai.goal.GoalSelector.tick(GoalSelector.java:149) ~[?:?]
	at net.minecraft.world.entity.Mob.serverAiStep(Mob.java:839) ~[?:?]
	at net.minecraft.world.entity.LivingEntity.aiStep(LivingEntity.java:3154) ~[?:?]
	at net.minecraft.world.entity.Mob.aiStep(Mob.java:625) ~[?:?]
	at net.minecraft.world.entity.monster.Monster.aiStep(Monster.java:43) ~[?:?]
	at net.minecraft.world.entity.monster.AbstractSkeleton.aiStep(AbstractSkeleton.java:130) ~[?:?]
	at net.minecraft.world.entity.LivingEntity.tick(LivingEntity.java:2880) ~[?:?]
	at net.minecraft.world.entity.Mob.tick(Mob.java:393) ~[?:?]
	at net.minecraft.world.entity.monster.Skeleton.tick(Skeleton.java:65) ~[?:?]
	at net.minecraft.server.level.ServerLevel.tickNonPassenger(ServerLevel.java:903) ~[?:?]
	at net.minecraft.world.level.Level.guardEntityTick(Level.java:869) ~[?:?]
	at net.minecraft.server.level.ServerLevel.lambda$tick$5(ServerLevel.java:600) ~[?:?]
	at net.minecraft.world.level.entity.EntityTickList.forEach(EntityTickList.java:54) ~[patched_1.17.1.jar:git-Paper-131]
	at net.minecraft.server.level.ServerLevel.tick(ServerLevel.java:581) ~[?:?]
	at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1553) ~[patched_1.17.1.jar:git-Paper-131]
	at net.minecraft.server.dedicated.DedicatedServer.tickChildren(DedicatedServer.java:479) ~[patched_1.17.1.jar:git-Paper-131]
	at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1406) ~[patched_1.17.1.jar:git-Paper-131]
	at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1188) ~[patched_1.17.1.jar:git-Paper-131]
	at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:316) ~[patched_1.17.1.jar:git-Paper-131]
	at java.lang.Thread.run(Thread.java:831) [?:?]