---- Minecraft Crash Report ----
// Why is it breaking :(

Time: 12/12/18 5:35 PM
Description: Exception ticking world

java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextNode(HashMap.java:1442)
	at java.util.HashMap$KeyIterator.next(HashMap.java:1466)
	at uo.b(SourceFile:105)
	at asf.j(SourceFile:229)
	at asf.l(SourceFile:326)
	at ash.a(SourceFile:80)
	at uq.a(SourceFile:206)
	at net.minecraft.server.MinecraftServer.b(SourceFile:836)
	at tr.b(SourceFile:337)
	at net.minecraft.server.MinecraftServer.a(SourceFile:773)
	at net.minecraft.server.MinecraftServer.run(SourceFile:639)
	at java.lang.Thread.run(Thread.java:748)


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

-- Head --
Thread: Server thread
Stacktrace:
	at java.util.HashMap$HashIterator.nextNode(HashMap.java:1442)
	at java.util.HashMap$KeyIterator.next(HashMap.java:1466)
	at uo.b(SourceFile:105)
	at asf.j(SourceFile:229)
	at asf.l(SourceFile:326)
	at ash.a(SourceFile:80)
	at uq.a(SourceFile:206)

-- Affected level --
Details:
	Level name: world
	All players: 3 total; [us['iffa'/484, l='world', x=378.80, y=64.00, z=225.06], us['juhojumala'/584, l='world', x=379.24, y=64.00, z=221.78], us['Warlord_99'/1735, l='world', x=371.07, y=63.94, z=229.27]]
	Chunk stats: ServerChunkCache: 2823
	Level seed: 6637869612472898978
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: {}
	Level spawn location: World: (35,63,243), Chunk: (at 3,3,3 in 2,15; contains blocks 32,0,240 to 47,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 152350179 game time, 152525178 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 35543 (now: false), thunder time: 47544 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
	at net.minecraft.server.MinecraftServer.b(SourceFile:836)
	at tr.b(SourceFile:337)
	at net.minecraft.server.MinecraftServer.a(SourceFile:773)
	at net.minecraft.server.MinecraftServer.run(SourceFile:639)
	at java.lang.Thread.run(Thread.java:748)

-- System Details --
Details:
	Minecraft Version: 18w50a
	Operating System: Linux (amd64) version 4.4.0-139-generic
	Java Version: 1.8.0_181, Oracle Corporation
	Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 691070616 bytes (659 MB) / 2098724864 bytes (2001 MB) up to 2098724864 bytes (2001 MB)
	JVM Flags: 2 total; -Xms2048M -Xmx2048M
	Player Count: 3 / 6; [us['iffa'/484, l='world', x=378.80, y=64.00, z=225.06], us['juhojumala'/584, l='world', x=379.24, y=64.00, z=221.78], us['Warlord_99'/1735, l='world', x=371.07, y=63.94, z=229.27]]
	Data Packs: vanilla
	Is Modded: Unknown (can't tell)
	Type: Dedicated Server (map_server.txt)