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[14:01:13 ERROR]: Entity threw exception at world:104.5,15.0,377.5 java.util.ConcurrentModificationException: null at java.util.LinkedHashMap$LinkedHashIterator.nextNode(LinkedHashMap.java:756) ~[?:?] at java.util.LinkedHashMap$LinkedKeyIterator.next(LinkedHashMap.java:778) ~[?:?] at net.minecraft.world.entity.ai.goal.GoalSelector.tick(GoalSelector.java:126) ~[?:?] at net.minecraft.world.entity.Mob.serverAiStep(Mob.java:920) ~[?:?] at net.minecraft.world.entity.LivingEntity.aiStep(LivingEntity.java:3351) ~[?:?] at net.minecraft.world.entity.Mob.aiStep(Mob.java:673) ~[?:?] at net.minecraft.world.entity.monster.Monster.aiStep(Monster.java:45) ~[?:?] at net.minecraft.world.entity.monster.Zombie.aiStep(Zombie.java:269) ~[?:?] at net.minecraft.world.entity.LivingEntity.tick(LivingEntity.java:3006) ~[?:?] at net.minecraft.world.entity.Mob.tick(Mob.java:435) ~[?:?] at net.minecraft.world.entity.monster.Zombie.tick(Zombie.java:239) ~[?:?] at net.minecraft.server.level.ServerLevel.tickNonPassenger(ServerLevel.java:1352) ~[?:?] at net.minecraft.world.level.Level.guardEntityTick(Level.java:919) ~[?:?] at net.minecraft.server.level.ServerLevel.lambda$tick$12(ServerLevel.java:872) ~[?:?] at net.minecraft.world.level.entity.EntityTickList.forEach(EntityTickList.java:42) ~[paper-1.20.1.jar:git-Paper-63] at net.minecraft.server.level.ServerLevel.tick(ServerLevel.java:852) ~[?:?] at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1557) ~[paper-1.20.1.jar:git-Paper-63] at net.minecraft.server.dedicated.DedicatedServer.tickChildren(DedicatedServer.java:447) ~[paper-1.20.1.jar:git-Paper-63] at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1394) ~[paper-1.20.1.jar:git-Paper-63] at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1171) ~[paper-1.20.1.jar:git-Paper-63] at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:318) ~[paper-1.20.1.jar:git-Paper-63] at java.lang.Thread.run(Thread.java:833) ~[?:?]