---- Minecraft Crash Report ----
// I just don't know what went wrong :(

Time: 17/5/2014 6:50 μμ
Description: Exception getting block type in world

java.lang.IllegalArgumentException: n must be positive
	at java.util.Random.nextInt(Unknown Source)
	at azn.a(SourceFile:442)
	at om.a(SourceFile:175)
	at ayg.a(SourceFile:847)
	at om.c(SourceFile:104)
	at om.d(SourceFile:117)
	at alh.b(SourceFile:290)
	at alh.f(SourceFile:285)
	at alh.c(SourceFile:221)
	at alh.d(SourceFile:236)
	at alh.b(SourceFile:202)
	at ayy.a(SourceFile:68)
	at on.b(SourceFile:649)
	at on.a(SourceFile:607)
	at clk.a(SourceFile:84)
	at clk.g(SourceFile:114)
	at net.minecraft.server.MinecraftServer.run(SourceFile:382)
	at nd.run(SourceFile:682)


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

-- Head --
Stacktrace:
	at java.util.Random.nextInt(Unknown Source)
	at azn.a(SourceFile:442)
	at om.a(SourceFile:175)
	at ayg.a(SourceFile:847)
	at om.c(SourceFile:104)
	at om.d(SourceFile:117)
	at alh.b(SourceFile:290)
	at alh.f(SourceFile:285)

-- Requested block coordinates --
Details:
	Found chunk: true
	Location: World: (18,64,143), Chunk: (at 2,4,15 in 1,8; contains blocks 16,0,128 to 31,255,143), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Stacktrace:
	at alh.c(SourceFile:221)
	at alh.d(SourceFile:236)
	at alh.b(SourceFile:202)
	at ayy.a(SourceFile:68)
	at on.b(SourceFile:649)

-- Affected level --
Details:
	Level name: 1.8 SNAPSHOT
	All players: 0 total; []
	Chunk stats: ServerChunkCache: 24 Drop: 0
	Level seed: -5941440758995336842
	Level generator: ID 04 - customized, ver 0. Features enabled: true
	Level generator options: {"coordinateScale":684.412,"heightScale":684.412,"lowerLimitScale":512.0,"upperLimitScale":512.0,"depthNoiseScaleX":200.0,"depthNoiseScaleZ":200.0,"depthNoiseScaleExponent":0.5,"mainNoiseScaleX":80.0,"mainNoiseScaleY":160.0,"mainNoiseScaleZ":80.0,"baseSize":8.5,"stretchY":12.0,"biomeDepthWeight":1.0,"biomeDepthOffset":0.0,"biomeScaleWeight":1.0,"biomeScaleOffset":0.0,"seaLevel":1,"useCaves":true,"useDungeons":true,"dungeonChance":100,"useStrongholds":true,"useVillages":true,"useMineShafts":true,"useTemples":false,"useRavines":true,"useWaterLakes":false,"waterLakeChance":1,"useLavaLakes":false,"lavaLakeChance":1,"useLavaOceans":true,"fixedBiome":36,"biomeSize":4,"riverSize":1,"dirtSize":50,"dirtCount":0,"dirtMinHeight":0,"dirtMaxHeight":256,"gravelSize":33,"gravelCount":8,"gravelMinHeight":0,"gravelMaxHeight":256,"graniteSize":1,"graniteCount":10,"graniteMinHeight":0,"graniteMaxHeight":80,"dioriteSize":33,"dioriteCount":10,"dioriteMinHeight":0,"dioriteMaxHeight":80,"andesiteSize":33,"andesiteCount":10,"andesiteMinHeight":0,"andesiteMaxHeight":80,"coalSize":17,"coalCount":20,"coalMinHeight":0,"coalMaxHeight":128,"ironSize":9,"ironCount":20,"ironMinHeight":0,"ironMaxHeight":64,"goldSize":9,"goldCount":2,"goldMinHeight":0,"goldMaxHeight":32,"redstoneSize":8,"redstoneCount":8,"redstoneMinHeight":0,"redstoneMaxHeight":16,"diamondSize":8,"diamondCount":1,"diamondMinHeight":0,"diamondMaxHeight":16,"lapisSize":7,"lapisCount":1,"lapisCenterHeight":16,"lapisSpread":16}
	Level spawn location: 0,00,0,00,0,00 - 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: 0x04ABD - Anvil
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
	at on.a(SourceFile:607)
	at clk.a(SourceFile:84)
	at clk.g(SourceFile:114)
	at net.minecraft.server.MinecraftServer.run(SourceFile:382)
	at nd.run(SourceFile:682)

-- System Details --
Details:
	Minecraft Version: 14w20b
	Operating System: Windows Vista (x86) version 6.0
	Java Version: 1.7.0_55, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 53918704 bytes (51 MB) / 125493248 bytes (119 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	IntCache: cache: 2, tcache: 0, allocated: 13, tallocated: 89
	Profiler Position: N/A (disabled)
	Player Count: 0 / 8; []
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.