Hopper: java.lang.ArrayIndexOutOfBoundsException: 402

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-397987/

Crash:

java.lang.ArrayIndexOutOfBoundsException: 402
	at azz.a(SourceFile:473)
	at azz.a(SourceFile:445)
	at bma.a(SourceFile:64)
	at bma.a(SourceFile:12)

The following is the first clean report made public about this crash:

---- Minecraft Crash Report ----
// This doesn't make any sense!

Time: 10/18/13 6:24 PM
Description: Rendering Block Entity

java.lang.ArrayIndexOutOfBoundsException: 960
	at azz.a(SourceFile:473)
	at azz.a(SourceFile:445)
	at bma.a(SourceFile:64)
	at bma.a(SourceFile:12)
	at blt.a(SourceFile:100)
	at blt.a(SourceFile:92)
	at blj.a(SourceFile:380)
	at blc.a(SourceFile:983)
	at blc.b(SourceFile:813)
	at ayw.ad(SourceFile:782)
	at ayw.e(SourceFile:706)
	at net.minecraft.client.main.Main.main(SourceFile:103)


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

-- Head --
Stacktrace:
	at azz.a(SourceFile:473)
	at azz.a(SourceFile:445)
	at bma.a(SourceFile:64)
	at bma.a(SourceFile:12)

-- Block Entity Details --
Details:
	Name: Sign // anr
	Block type: ID #63 (tile.sign // alp)
	Block data value: 10 / 0xA / 0b1010
	Block location: World: (64,78,296), Chunk: (at 0,4,8 in 4,18; contains blocks 64,0,288 to 79,255,303), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Actual block type: ID #63 (tile.sign // alp)
	Actual block data value: 10 / 0xA / 0b1010
Stacktrace:
	at blt.a(SourceFile:100)
	at blt.a(SourceFile:92)
	at blj.a(SourceFile:380)
	at blc.a(SourceFile:983)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [biw['atomoclk00'/374, l='MpServer', x=68.46, y=80.12, z=294.47]]
	Chunk stats: MultiplayerChunkCache: 30, 30
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (156,64,236), Chunk: (at 12,4,12 in 9,14; contains blocks 144,0,224 to 159,255,239), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 36890 game time, 5976 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
	Forced entities: 20 total; [wi['Creeper'/169, l='MpServer', x=71.00, y=49.00, z=310.59], un['Fledermaus'/168, l='MpServer', x=64.50, y=49.10, z=298.22], wi['Creeper'/110, l='MpServer', x=40.50, y=39.00, z=267.50], wu['Skelett'/111, l='MpServer', x=34.50, y=53.00, z=285.50], wu['Skelett'/167, l='MpServer', x=69.50, y=50.00, z=260.50], wi['Creeper'/166, l='MpServer', x=78.50, y=55.00, z=261.50], wz['Zombie'/195, l='MpServer', x=89.50, y=36.00, z=263.50], wu['Skelett'/152, l='MpServer', x=58.56, y=74.00, z=305.72], biw['atomoclk00'/374, l='MpServer', x=68.46, y=80.12, z=294.47], ux['Schwein'/153, l='MpServer', x=53.47, y=79.00, z=327.69], ux['Schwein'/113, l='MpServer', x=36.88, y=78.00, z=321.09], wu['Skelett'/112, l='MpServer', x=33.50, y=53.00, z=283.50], vb['Tintenfisch'/212, l='MpServer', x=113.19, y=61.00, z=278.16], wz['Zombie'/147, l='MpServer', x=59.47, y=48.00, z=271.69], wj['Enderman'/148, l='MpServer', x=58.03, y=50.00, z=279.25], wz['Zombie'/209, l='MpServer', x=100.50, y=28.00, z=262.50], wz['Zombie'/149, l='MpServer', x=63.03, y=52.00, z=283.53], wu['Skelett'/150, l='MpServer', x=60.38, y=74.08, z=302.88], wi['Creeper'/210, l='MpServer', x=105.22, y=20.00, z=273.06], wu['Skelett'/151, l='MpServer', x=58.22, y=73.26, z=304.59]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bir.a(SourceFile:284)
	at ayw.b(SourceFile:1938)
	at ayw.e(SourceFile:715)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 13w42b
	Operating System: Mac OS X (x86_64) version 10.8.1
	Java Version: 1.6.0_35, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 92475552 bytes (88 MB) / 211435520 bytes (201 MB) up to 1069416448 bytes (1019 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 12179 (682024 bytes; 0 MB) allocated, 2496 (139776 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
	Launched Version: 13w42b
	LWJGL: 2.9.1
	OpenGL: NVIDIA GeForce 9400M OpenGL Engine GL version 2.1 NVIDIA-8.0.51, NVIDIA Corporation
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: Deutsch (Deutschland)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 1022 (57232 bytes; 0 MB) allocated, 1022 (57232 bytes; 0 MB) used
	Anisotropic Filtering: Off (1)

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-397987/19100619/