Hopper: java.lang.ArrayIndexOutOfBoundsException: 151720

java.lang.ArrayIndexOutOfBoundsException: 151720
	at adv.a(SourceFile:193)
	at ako.e(SourceFile:194)
	at ako.b(SourceFile:13)
	at ala.a(SourceFile:526)
	at akn.<init>(SourceFile:93)
	at akm.b(SourceFile:66)
	at akf.a(SourceFile:29)
	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: 5/09/13 18:30
Description: Invalid Biome id

java.lang.ArrayIndexOutOfBoundsException: 151720
	at adv.a(SourceFile:193)
	at ako.e(SourceFile:194)
	at ako.b(SourceFile:13)
	at ala.a(SourceFile:526)
	at akn.<init>(SourceFile:93)
	at akm.b(SourceFile:66)
	at akf.a(SourceFile:29)
	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@62c8aeb3
	x: 29999857
	z: 29999790
	radius: 21
	allowed: [aej@71e852be, adw@4b90725e, aem@50f8ae79]
Stacktrace:
	at adv.a(SourceFile:193)
	at ako.e(SourceFile:194)
	at ako.b(SourceFile:13)
	at ala.a(SourceFile:526)
	at akn.<init>(SourceFile:93)
	at akm.b(SourceFile:66)

-- Feature being prepared --
Details:
	Is feature chunk: True
	Chunk location: 1874992,1874988
	Chunk pos hash: 8053012142267440
	Structure type: akm
Stacktrace:
	at akf.a(SourceFile:29)
	at afz.a(SourceFile:29)
	at agb.d(SourceFile:201)

-- Chunk to be generated --
Details:
	Location: 1874989,1874989
	Position hash: 8053016437234733
	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: Mac OS X (x86_64) version 10.6.8
	Java Version: 1.6.0_51, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 52255488 bytes (49 MB) / 128176128 bytes (122 MB) up to 1069416448 bytes (1019 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 1540 (86240 bytes; 0 MB) allocated, 1540 (86240 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: 0, allocated: 13, tallocated: 123
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 201 (11256 bytes; 0 MB) allocated, 201 (11256 bytes; 0 MB) used
	Player Count: 1 / 8; [kg['starmax1000'/138, l='snapshot biomes', x=29999999,50, y=70,50, z=29999999,50]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.