Exception ticking world

---- Minecraft Crash Report ----
// This doesn't make any sense!

Time: 4/20/14 9:02 PM
Description: Exception ticking world

java.lang.IllegalArgumentException: n must be positive
	at java.util.Random.nextInt(Random.java:250)
	at alg.a(SourceFile:133)
	at alg.a(SourceFile:29)
	at akz.a(SourceFile:387)
	at alv.a(SourceFile:74)
	at avt.a(SourceFile:443)
	at ny.a(SourceFile:175)
	at aup.a(SourceFile:851)
	at ny.c(SourceFile:104)
	at ny.d(SourceFile:117)
	at akh.b(SourceFile:287)
	at nz.h(SourceFile:271)
	at nz.c(SourceFile:162)
	at net.minecraft.server.MinecraftServer.w(SourceFile:539)
	at net.minecraft.server.MinecraftServer.v(SourceFile:481)
	at cek.v(SourceFile:128)
	at net.minecraft.server.MinecraftServer.run(SourceFile:397)
	at mq.run(SourceFile:667)


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

-- Head --
Stacktrace:
	at java.util.Random.nextInt(Random.java:250)
	at alg.a(SourceFile:133)
	at alg.a(SourceFile:29)
	at akz.a(SourceFile:387)
	at alv.a(SourceFile:74)
	at avt.a(SourceFile:443)
	at ny.a(SourceFile:175)
	at aup.a(SourceFile:851)
	at ny.c(SourceFile:104)
	at ny.d(SourceFile:117)
	at akh.b(SourceFile:287)
	at nz.h(SourceFile:271)
	at nz.c(SourceFile:162)

-- Affected level --
Details:
	Level name: TNT Olympics
	All players: 1 total; [oc['astral12312'/175666, l='TNT Olympics', x=-144.29, y=103.61, z=-44.86]]
	Chunk stats: ServerChunkCache: 1173 Drop: 0
	Level seed: -1688241572223531008
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: 0.00,64.00,0.00 - World: (0,64,0), Chunk: (at 0,4,0 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: 165588 game time, 155548 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 93620 (now: false), thunder time: 64912 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.w(SourceFile:539)
	at net.minecraft.server.MinecraftServer.v(SourceFile:481)
	at cek.v(SourceFile:128)
	at net.minecraft.server.MinecraftServer.run(SourceFile:397)
	at mq.run(SourceFile:667)

-- System Details --
Details:
	Minecraft Version: 14w11b
	Operating System: Mac OS X (x86_64) version 10.8.5
	Java Version: 1.6.0_65, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 200153504 bytes (190 MB) / 693833728 bytes (661 MB) up to 1065025536 bytes (1015 MB)
	JVM Flags: 1 total; -Xmx1G
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Player Count: 1 / 8; [oc['astral12312'/175666, l='TNT Olympics', x=-144.29, y=103.61, z=-44.86]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.