---- Minecraft Crash Report ----
// Daisy, daisy...

Time: 17/04/17 3:35 PM
Description: Exception ticking world

java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.remove(Unknown Source)
	at no.d(SourceFile:198)
	at np.d(SourceFile:203)
	at net.minecraft.server.MinecraftServer.D(SourceFile:626)
	at na.D(SourceFile:335)
	at net.minecraft.server.MinecraftServer.C(SourceFile:562)
	at net.minecraft.server.MinecraftServer.run(SourceFile:466)
	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.HashMap$HashIterator.remove(Unknown Source)
	at no.d(SourceFile:198)
	at np.d(SourceFile:203)

-- Affected level --
Details:
	Level name: world
	All players: 2 total; [nr['MC_AlexV'/459, l='world', x=5.70, y=64.00, z=29.70], nr['VulcaanVex'/4315, l='world', x=48.08, y=65.00, z=46.50]]
	Chunk stats: ServerChunkCache: 602 Drop: 63
	Level seed: -2667580921684139418
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (8,64,8), Chunk: (at 8,4,8 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 390538 game time, 390538 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 122675 (now: false), thunder time: 47093 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
	at net.minecraft.server.MinecraftServer.D(SourceFile:626)
	at na.D(SourceFile:335)
	at net.minecraft.server.MinecraftServer.C(SourceFile:562)
	at net.minecraft.server.MinecraftServer.run(SourceFile:466)
	at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
	Minecraft Version: 17w15a
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.8.0_31, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 119990368 bytes (114 MB) / 259522560 bytes (247 MB) up to 259522560 bytes (247 MB)
	JVM Flags: 0 total; 
	IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
	Profiler Position: N/A (disabled)
	Player Count: 2 / 20; [nr['MC_AlexV'/459, l='world', x=5.70, y=64.00, z=29.70], nr['VulcaanVex'/4315, l='world', x=48.08, y=65.00, z=46.50]]
	Is Modded: Unknown (can't tell)
	Type: Dedicated Server (map_server.txt)