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---- Minecraft Crash Report ----
// Why did you do that?

Time: 6/12/19 3:13 AM
Description: Exception ticking world

java.util.ConcurrentModificationException
    at java.util.LinkedList$ListItr.checkForComodification(Unknown Source)
    at java.util.LinkedList$ListItr.next(Unknown Source)
    at net.minecraft.server.v1_12_R1.StructureStart.a(StructureStart.java:36)
    at net.minecraft.server.v1_12_R1.StructureGenerator.a(StructureGenerator.java:90)
    at net.minecraft.server.v1_12_R1.ChunkProviderGenerate.recreateStructures(ChunkProviderGeneeateStructuresrate.java:333)
    at org.bukkit.craftbukkit.v1_12_R1.generator.NormalChunkGenerator.recr(NormalChunkGenerator.java:41)
    at co.aikar.timings.TimedChunkGenerator.recreateStructures(TimedChunkGenerator.java:100)
    at net.minecraft.server.v1_12_R1.Chunk.a(Chunk.java:1158)
    at net.minecraft.server.v1_12_R1.Chunk.loadNearby(Chunk.java:1137)
    at net.minecraft.server.v1_12_R1.ChunkProviderServer.originalGetChunkAt(ChunkProviderServer.java:213)
    at net.minecraft.server.v1_12_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:180)
    at net.minecraft.server.v1_12_R1.PlayerChunk.a(PlayerChunk.java:123)
    at net.minecraft.server.v1_12_R1.PlayerChunkMap.flush(PlayerChunkMap.java:185)
    at net.minecraft.server.v1_12_R1.WorldServer.doTick(WorldServer.java:332)
    at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:905)
    at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:423)
    at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:774)
    at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:666)
    at java.lang.Thread.run(Unknown Source)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Server thread
Stacktrace:
    at java.util.LinkedList$ListItr.checkForComodification(Unknown Source)
    at java.util.LinkedList$ListItr.next(Unknown Source)
    at net.minecraft.server.v1_12_R1.StructureStart.a(StructureStart.java:36)
    at net.minecraft.server.v1_12_R1.StructureGenerator.a(StructureGenerator.java:90)
    at net.minecraft.server.v1_12_R1.ChunkProviderGenerate.recreateStructures(ChunkProviderGenerate.java:333)
    at org.bukkit.craftbukkit.v1_12_R1.generator.NormalChunkGenerator.recreateStructures(NormalChunkGenerator.java:41)
    at co.aikar.timings.TimedChunkGenerator.recreateStructures(TimedChunkGenerator.java:100)
    at net.minecraft.server.v1_12_R1.Chunk.a(Chunk.java:1158)
    at net.minecraft.server.v1_12_R1.Chunk.loadNearby(Chunk.java:1137)
    at net.minecraft.server.v1_12_R1.ChunkProviderServer.originalGetChunkAt(ChunkProviderServer.java:213)
    at net.minecraft.server.v1_12_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:180)
    at net.minecraft.server.v1_12_R1.PlayerChunk.a(PlayerChunk.java:123)
    at net.minecraft.server.v1_12_R1.PlayerChunkMap.flush(PlayerChunkMap.java:185)
    at net.minecraft.server.v1_12_R1.WorldServer.doTick(WorldServer.java:332)