Hopper: java.lang.ArrayIndexOutOfBoundsException: 696

java.lang.ArrayIndexOutOfBoundsException: 696
	at adp.a(SourceFile:28)
	at ads.b(SourceFile:75)
	at adr.c(SourceFile:326)
	at abw.h(SourceFile:341)
	at abw.w(SourceFile:1719)
	at aci.a(SourceFile:152)
	at aci.a(SourceFile:100)
	at js.b(SourceFile:107)

---- Minecraft Crash Report ----
// Quite honestly, I wouldn't worry myself about that.

Time: 9/20/13 7:28 PM
Description: Exception ticking world

java.lang.ArrayIndexOutOfBoundsException: 1667
	at adp.a(SourceFile:28)
	at ads.b(SourceFile:75)
	at adr.c(SourceFile:326)
	at abw.h(SourceFile:341)
	at abw.w(SourceFile:1719)
	at aci.a(SourceFile:152)
	at aci.a(SourceFile:100)
	at js.b(SourceFile:107)
	at net.minecraft.server.MinecraftServer.t(SourceFile:463)
	at net.minecraft.server.MinecraftServer.s(SourceFile:406)
	at bkz.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:340)
	at hi.run(SourceFile:583)


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

-- Head --
Stacktrace:
	at adp.a(SourceFile:28)
	at ads.b(SourceFile:75)
	at adr.c(SourceFile:326)
	at abw.h(SourceFile:341)
	at abw.w(SourceFile:1719)
	at aci.a(SourceFile:152)
	at aci.a(SourceFile:100)
	at js.b(SourceFile:107)

-- Affected level --
Details:
	Level name: Sky Blocks 1.6.2 Alpha
	All players: 1 total; [jv['demonmaster12'/18713, l='Sky Blocks 1.6.2 Alpha', x=-319.42, y=5.02, z=-906.46]]
	Chunk stats: ServerChunkCache: 476 Drop: 0
	Level seed: -5847896021244097455
	Level generator: ID 01 - flat, ver 0. Features enabled: true
	Level generator options: 2;;1;biome_1,village
	Level spawn location: World: (-309,4,-948), Chunk: (at 11,0,12 in -20,-60; contains blocks -320,0,-960 to -305,255,-945), Region: (-1,-2; contains chunks -32,-64 to -1,-33, blocks -512,0,-1024 to -1,255,-513)
	Level time: 337838 game time, 65422 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 39411 (now: false), thunder time: 27896 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
	at net.minecraft.server.MinecraftServer.t(SourceFile:463)
	at net.minecraft.server.MinecraftServer.s(SourceFile:406)
	at bkz.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:340)
	at hi.run(SourceFile:583)

-- System Details --
Details:
	Minecraft Version: 1.6.4
	Operating System: Windows Vista (amd64) version 6.0
	Java Version: 1.6.0_13, Sun Microsystems Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
	Memory: 53881784 bytes (51 MB) / 331022336 bytes (315 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 715 (40040 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 88 (4928 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Player Count: 1 / 8; [jv['demonmaster12'/18713, l='Sky Blocks 1.6.2 Alpha', x=-319.42, y=5.02, z=-906.46]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.