Hopper: java.lang.ArrayIndexOutOfBoundsException: 290692

java.lang.ArrayIndexOutOfBoundsException: 290692
	at adv.a(SourceFile:193)
	at akm.a(SourceFile:54)
	at akf.a(SourceFile:28)
	at afz.a(SourceFile:29)
	at agb.d(SourceFile:201)
	at kc.c(SourceFile:72)
	at kb.<init>(SourceFile:28)
	at ka.a(SourceFile:209)
	at ka.a(SourceFile:246)
	at hx.a(SourceFile:151)
	at hx.c(SourceFile:199)
	at hx.a(SourceFile:95)
	at bnj.b(SourceFile:73)
	at net.minecraft.server.MinecraftServer.t(SourceFile:481)
	at net.minecraft.server.MinecraftServer.s(SourceFile:398)
	at bng.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:332)
	at hs.run(SourceFile:575)

---- Minecraft Crash Report ----
// Hey, that tickles! Hehehe!

Time: 05/09/13 8:49 PM
Description: Invalid Biome id

java.lang.ArrayIndexOutOfBoundsException: -1
	at adv.a(SourceFile:193)
	at akm.a(SourceFile:54)
	at akf.a(SourceFile:28)
	at afz.a(SourceFile:29)
	at agb.d(SourceFile:201)
	at kc.c(SourceFile:72)
	at kb.<init>(SourceFile:28)
	at ka.a(SourceFile:209)
	at ka.a(SourceFile:246)
	at hx.a(SourceFile:151)
	at hx.c(SourceFile:199)
	at hx.a(SourceFile:95)
	at bnj.b(SourceFile:73)
	at net.minecraft.server.MinecraftServer.t(SourceFile:481)
	at net.minecraft.server.MinecraftServer.s(SourceFile:398)
	at bng.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:332)
	at hs.run(SourceFile:575)


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

-- Layer --
Details:
	Layer: ams@2040c8a4
	x: -4568
	z: -3032
	radius: 0
	allowed: [aej@3d762a6, adw@318d8242, aem@209fda1a]
Stacktrace:
	at adv.a(SourceFile:193)
	at akm.a(SourceFile:54)

-- Feature being prepared --
Details:
	Is feature chunk: False
	Chunk location: -286,-190
	Chunk pos hash: -811748819230
	Structure type: akm
Stacktrace:
	at akf.a(SourceFile:28)
	at afz.a(SourceFile:29)
	at agb.d(SourceFile:201)

-- Chunk to be generated --
Details:
	Location: -285,-193
	Position hash: -824633721117
	Generator: RandomLevelSource
Stacktrace:
	at kc.c(SourceFile:72)
	at kb.<init>(SourceFile:28)
	at ka.a(SourceFile:209)
	at ka.a(SourceFile:246)
	at hx.a(SourceFile:151)
	at hx.c(SourceFile:199)
	at hx.a(SourceFile:95)
	at bnj.b(SourceFile:73)
	at net.minecraft.server.MinecraftServer.t(SourceFile:481)
	at net.minecraft.server.MinecraftServer.s(SourceFile:398)
	at bng.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:332)
	at hs.run(SourceFile:575)

-- System Details --
Details:
	Minecraft Version: 13w36a
	Operating System: Windows 8 (amd64) version 6.2
	Java Version: 1.7.0_09, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 299562088 bytes (285 MB) / 382337024 bytes (364 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 1112 (62272 bytes; 0 MB) allocated, 1112 (62272 bytes; 0 MB) used
	Suspicious classes: [com.ibm.icu.text.ArabicShapingException], [gnu.trove.TIntCollection], [gnu.trove.impl.HashFunctions, PrimeFinder], [gnu.trove.impl.hash.THash, TPrimitiveHash, TIntIntHash], [gnu.trove.iterator.TIterator, TAdvancingIterator, TIntIntIterator], [gnu.trove.map.TIntIntMap], [gnu.trove.map.hash.TIntIntHashMap], [gnu.trove.procedure.TIntIntProcedure], [gnu.trove.set.TIntSet]
	IntCache: cache: 0, tcache: 16, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 186 (10416 bytes; 0 MB) allocated, 186 (10416 bytes; 0 MB) used
	Player Count: 1 / 8; [kg['Chapmanclam'/123, l='Snapshot 1.7', x=-4386.16, y=86.52, z=-2950.20]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.