Hopper: java.lang.ArrayIndexOutOfBoundsException: 7

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

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

Time: 10/25/13 5:10 PM
Description: Exception while updating neighbours

java.lang.ArrayIndexOutOfBoundsException: 7
	at aoc.a(SourceFile:203)
	at afn.e(SourceFile:480)
	at afn.d(SourceFile:459)
	at afn.c(SourceFile:428)
	at afn.d(SourceFile:337)
	at zt.a(SourceFile:68)
	at abp.a(SourceFile:107)
	at mn.a(SourceFile:248)
	at mx.a(SourceFile:365)
	at jc.a(SourceFile:60)
	at jc.a(SourceFile:9)
	at ef.a(SourceFile:164)
	at ms.c(SourceFile:134)
	at net.minecraft.server.MinecraftServer.u(SourceFile:529)
	at net.minecraft.server.MinecraftServer.t(SourceFile:441)
	at bsk.t(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:358)
	at ky.run(SourceFile:617)


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

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

-- Block being updated --
Details:
	Source block type: ID #0 (tile.air // ahm)
	Block type: ID #34 (tile.null // aoc)
	Block data value: 15 / 0xF / 0b1111
	Block location: World: (925,4,228), Chunk: (at 13,0,4 in 57,14; contains blocks 912,0,224 to 927,255,239), Region: (1,0; contains chunks 32,0 to 63,31, blocks 512,0,0 to 1023,255,511)
Stacktrace:
	at afn.e(SourceFile:480)
	at afn.d(SourceFile:459)
	at afn.c(SourceFile:428)
	at afn.d(SourceFile:337)
	at zt.a(SourceFile:68)
	at abp.a(SourceFile:107)
	at mn.a(SourceFile:248)
	at mx.a(SourceFile:365)
	at jc.a(SourceFile:60)
	at jc.a(SourceFile:9)
	at ef.a(SourceFile:164)

-- Ticking connection --
Details:
	Connection: ef@20cc21
Stacktrace:
	at ms.c(SourceFile:134)
	at net.minecraft.server.MinecraftServer.u(SourceFile:529)
	at net.minecraft.server.MinecraftServer.t(SourceFile:441)
	at bsk.t(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:358)
	at ky.run(SourceFile:617)

-- System Details --
Details:
	Minecraft Version: 1.7.2
	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: 146985472 bytes (140 MB) / 435068928 bytes (414 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 2203 (123368 bytes; 0 MB) allocated, 1998 (111888 bytes; 0 MB) used
	IntCache: cache: 1, tcache: 1, allocated: 12, tallocated: 94
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 230 (12880 bytes; 0 MB) allocated, 209 (11704 bytes; 0 MB) used
	Player Count: 1 / 8; [mm['lammdc01'/181339, l='New World', x=921.25, y=4.00, z=228.55]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.