Hopper: java.lang.ArrayIndexOutOfBoundsException: 7

java.lang.ArrayIndexOutOfBoundsException: 7
	at avn.a(SourceFile:203)

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

Time: 2013-09-13 22:39
Description: Exception while updating neighbours

java.lang.ArrayIndexOutOfBoundsException: 6
	at avn.a(SourceFile:203)
	at add.e(SourceFile:487)
	at add.d(SourceFile:469)
	at add.c(SourceFile:434)
	at add.d(SourceFile:337)
	at aal.a(SourceFile:69)
	at zg.a(SourceFile:108)
	at kq.a(SourceFile:252)
	at ku.a(SourceFile:357)
	at ic.a(SourceFile:58)
	at ea.b(SourceFile:64)
	at ku.e(SourceFile:63)
	at kx.b(SourceFile:37)
	at boc.b(SourceFile:84)
	at net.minecraft.server.MinecraftServer.u(SourceFile:483)
	at net.minecraft.server.MinecraftServer.t(SourceFile:400)
	at bnz.t(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:334)
	at jb.run(SourceFile:577)


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

-- Head --
Stacktrace:
	at avn.a(SourceFile:203)

-- Block being updated --
Details:
	Source block type: ID #0
	Block type: ID #34 (tile.null // avn)
	Block data value: 6 / 0x6 / 0b0110
	Block location: World: (334,53,-1098), Chunk: (at 14,3,6 in 20,-69; contains blocks 320,0,-1104 to 335,255,-1089), Region: (0,-3; contains chunks 0,-96 to 31,-65, blocks 0,0,-1536 to 511,255,-1025)
Stacktrace:
	at add.e(SourceFile:487)
	at add.d(SourceFile:469)
	at add.c(SourceFile:434)
	at add.d(SourceFile:337)
	at aal.a(SourceFile:69)
	at zg.a(SourceFile:108)
	at kq.a(SourceFile:252)
	at ku.a(SourceFile:357)
	at ic.a(SourceFile:58)
	at ea.b(SourceFile:64)
	at ku.e(SourceFile:63)

-- Ticking connection --
Details:
	Connection: ku@2b0facc4
Stacktrace:
	at kx.b(SourceFile:37)
	at boc.b(SourceFile:84)
	at net.minecraft.server.MinecraftServer.u(SourceFile:483)
	at net.minecraft.server.MinecraftServer.t(SourceFile:400)
	at bnz.t(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:334)
	at jb.run(SourceFile:577)

-- System Details --
Details:
	Minecraft Version: 13w37b
	Operating System: Mac OS X (x86_64) version 10.7.5
	Java Version: 1.6.0_37, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 97960448 bytes (93 MB) / 301776896 bytes (287 MB) up to 1065025536 bytes (1015 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 453 (25368 bytes; 0 MB) allocated, 369 (20664 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 60 (3360 bytes; 0 MB) allocated, 41 (2296 bytes; 0 MB) used
	Player Count: 1 / 8; [kp['Wsen'/33, l='Test', x=336,73, y=53,00, z=-1097,05]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.