---- Minecraft Crash Report ----
// Hi. I'm Minecraft, and I'm a crashaholic.

Time: 06/11/15 11:18
Description: Exception generating new chunk

java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)
	at java.util.HashMap$KeyIterator.next(HashMap.java:1453)
	at ny.<init>(SourceFile:26)
	at arw.<init>(SourceFile:82)
	at arw.<init>(SourceFile:89)
	at atg.a(SourceFile:176)
	at lp.d(SourceFile:99)
	at lv.a(SourceFile:85)
	at lw.c(SourceFile:146)
	at lq.d(SourceFile:221)
	at net.minecraft.server.MinecraftServer.D(SourceFile:610)
	at net.minecraft.server.MinecraftServer.C(SourceFile:546)
	at bxx.C(SourceFile:154)
	at net.minecraft.server.MinecraftServer.run(SourceFile:450)
	at java.lang.Thread.run(Thread.java:745)


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

-- Head --
Stacktrace:
	at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)
	at java.util.HashMap$KeyIterator.next(HashMap.java:1453)
	at ny.<init>(SourceFile:26)
	at arw.<init>(SourceFile:82)
	at arw.<init>(SourceFile:89)
	at atg.a(SourceFile:176)

-- Chunk to be generated --
Details:
	Location: 11,-6
	Position hash: -25769803765
	Generator: atg@e0c1e3f
Stacktrace:
	at lp.d(SourceFile:99)
	at lv.a(SourceFile:85)
	at lw.c(SourceFile:146)
	at lq.d(SourceFile:221)

-- Affected level --
Details:
	Level name: Dave 1.9
	All players: 1 total; [ls['DaveJunior81'/296, l='Dave 1.9', x=100.44, y=49.00, z=1.43]]
	Chunk stats: ServerChunkCache: 338 Drop: 0
	Level seed: -4419274609318357654
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (0,0,0), Chunk: (at 0,0,0 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: 0 game time, 0 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at net.minecraft.server.MinecraftServer.D(SourceFile:610)
	at net.minecraft.server.MinecraftServer.C(SourceFile:546)
	at bxx.C(SourceFile:154)
	at net.minecraft.server.MinecraftServer.run(SourceFile:450)
	at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
	Minecraft Version: 15w45a
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 3453142944 bytes (3293 MB) / 4244635648 bytes (4048 MB) up to 4244635648 bytes (4048 MB)
	JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx4096M -Xms4096M
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Player Count: 1 / 8; [ls['DaveJunior81'/296, l='Dave 1.9', x=100.44, y=49.00, z=1.43]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.