Hopper: java.lang.ArrayIndexOutOfBoundsException: 248

java.lang.ArrayIndexOutOfBoundsException: 248
	at anv.d(SourceFile:595)
	at afe.i(SourceFile:513)
	at afe.a(SourceFile:1957)
	at afe.c(SourceFile:1988)
	at afe.t(SourceFile:1949)
	at afe.C(SourceFile:1865)
	at afe.g(SourceFile:1897)
	at mc.g(SourceFile:224)
	at mc.b(SourceFile:136)

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

Time: 14.10.13 06:30
Description: Exception ticking world

java.lang.ArrayIndexOutOfBoundsException: 248
	at anv.d(SourceFile:595)
	at afe.i(SourceFile:513)
	at afe.a(SourceFile:1957)
	at afe.c(SourceFile:1988)
	at afe.t(SourceFile:1949)
	at afe.C(SourceFile:1865)
	at afe.g(SourceFile:1897)
	at mc.g(SourceFile:224)
	at mc.b(SourceFile:136)
	at net.minecraft.server.MinecraftServer.u(SourceFile:503)
	at net.minecraft.server.MinecraftServer.t(SourceFile:441)
	at brh.t(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:358)
	at kt.run(SourceFile:617)


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

-- Head --
Stacktrace:
	at anv.d(SourceFile:595)
	at afe.i(SourceFile:513)
	at afe.a(SourceFile:1957)
	at afe.c(SourceFile:1988)
	at afe.t(SourceFile:1949)
	at afe.C(SourceFile:1865)
	at afe.g(SourceFile:1897)
	at mc.g(SourceFile:224)
	at mc.b(SourceFile:136)

-- Affected level --
Details:
	Level name: Adventuremap dungeon 1
	All players: 1 total; [mf['WitherBossEntity'/8, l='Adventuremap dungeon 1', x=-279,69, y=27,64, z=-363,27]]
	Chunk stats: ServerChunkCache: 738 Drop: 0
	Level seed: 4559475637892062901
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 2;7,3x1,22x24;2;
	Level spawn location: World: (-347,4,-266), Chunk: (at 5,0,6 in -22,-17; contains blocks -352,0,-272 to -337,255,-257), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Level time: 522974 game time, 6000 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 32033 (now: false), thunder time: 108987 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.u(SourceFile:503)
	at net.minecraft.server.MinecraftServer.t(SourceFile:441)
	at brh.t(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:358)
	at kt.run(SourceFile:617)

-- System Details --
Details:
	Minecraft Version: 13w41b
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 232953336 bytes (222 MB) / 518979584 bytes (494 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 116 (6496 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 8 (448 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Player Count: 1 / 8; [mf['WitherBossEntity'/8, l='Adventuremap dungeon 1', x=-279,69, y=27,64, z=-363,27]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.