Hopper: java.lang.IndexOutOfBoundsException: Index: 46, Size: 45

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-190644/

Crash:

java.lang.IndexOutOfBoundsException: Index: 46, Size: 45
	at java.util.ArrayList.rangeCheck(Unknown Source)
	at java.util.ArrayList.get(Unknown Source)
	at uy.a(SourceFile:314)
	at bdc.a(SourceFile:295)
	at awy.a(SourceFile:582)
	at awy.a(SourceFile:595)
	at awe.n(SourceFile:149)
	at awe.m(SourceFile:111)

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

---- Minecraft Crash Report ----
// You're mean.

Time: 19/09/13 18:43
Description: Updating screen events

java.lang.IndexOutOfBoundsException: Index: 81, Size: 45
	at java.util.ArrayList.rangeCheck(Unknown Source)
	at java.util.ArrayList.get(Unknown Source)
	at uy.a(SourceFile:314)
	at bdc.a(SourceFile:295)
	at awy.a(SourceFile:582)
	at awy.a(SourceFile:595)
	at awe.n(SourceFile:149)
	at awe.m(SourceFile:111)
	at atv.k(SourceFile:1158)
	at atv.S(SourceFile:663)
	at atv.d(SourceFile:619)
	at net.minecraft.client.main.Main.main(SourceFile:101)


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

-- Head --
Stacktrace:
	at java.util.ArrayList.rangeCheck(Unknown Source)
	at java.util.ArrayList.get(Unknown Source)
	at uy.a(SourceFile:314)
	at bdc.a(SourceFile:295)
	at awy.a(SourceFile:582)
	at awy.a(SourceFile:595)
	at awe.n(SourceFile:149)
	at awe.m(SourceFile:111)

-- Affected screen --
Details:
	Screen name: ~~ERROR~~ NullPointerException: null

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bdi['deziiah'/138, l='MpServer', x=-1179.84, y=71.62, z=765.94]]
	Chunk stats: MultiplayerChunkCache: 441
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-236,64,228), Chunk: (at 4,4,4 in -15,14; contains blocks -240,0,224 to -225,255,239), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 270127 game time, 279985 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: 45 total; [ro['Bat'/111075, l='MpServer', x=-1220.54, y=18.45, z=701.53], sc['Squid'/110974, l='MpServer', x=-1243.56, y=61.33, z=772.59], sc['Squid'/110973, l='MpServer', x=-1245.41, y=61.34, z=779.09], sc['Squid'/110972, l='MpServer', x=-1237.72, y=59.88, z=783.66], ro['Bat'/111091, l='MpServer', x=-1246.50, y=50.00, z=809.75], su['entity.MinecartChest.name'/159, l='MpServer', x=-1259.50, y=14.34, z=778.50], su['entity.MinecartChest.name'/85700, l='MpServer', x=-1222.50, y=15.50, z=811.50], ro['Bat'/111044, l='MpServer', x=-1234.41, y=17.10, z=784.75], rr['Cow'/85701, l='MpServer', x=-1217.72, y=63.00, z=814.44], rz['Sheep'/103208, l='MpServer', x=-1100.59, y=75.00, z=757.25], rz['Sheep'/103209, l='MpServer', x=-1102.84, y=68.00, z=775.31], oe['entity.LeashKnot.name'/308, l='MpServer', x=-1193.50, y=77.50, z=746.50], ro['Bat'/111043, l='MpServer', x=-1239.53, y=15.00, z=786.78], su['entity.MinecartChest.name'/85698, l='MpServer', x=-1257.50, y=19.34, z=809.50], su['entity.MinecartChest.name'/85699, l='MpServer', x=-1256.50, y=20.50, z=800.50], rr['Cow'/92040, l='MpServer', x=-1222.94, y=64.00, z=822.94], rr['Cow'/92041, l='MpServer', x=-1217.06, y=64.00, z=825.84], rr['Cow'/92042, l='MpServer', x=-1207.50, y=64.00, z=820.63], ro['Bat'/110813, l='MpServer', x=-1214.51, y=41.38, z=833.30], ry['Pig'/85704, l='MpServer', x=-1210.91, y=63.00, z=811.03], rz['Sheep'/102357, l='MpServer', x=-1146.16, y=68.00, z=787.63], rz['Sheep'/102356, l='MpServer', x=-1146.34, y=64.00, z=789.94], su['entity.MinecartChest.name'/102802, l='MpServer', x=-1221.50, y=16.50, z=847.50], rs['Horse'/102803, l='MpServer', x=-1196.03, y=63.00, z=842.00], rz['Sheep'/189, l='MpServer', x=-1192.03, y=68.00, z=786.03], su['entity.MinecartChest.name'/177, l='MpServer', x=-1204.50, y=11.50, z=751.50], rs['Horse'/181, l='MpServer', x=-1191.81, y=76.00, z=745.03], bdi['deziiah'/138, l='MpServer', x=-1179.84, y=71.62, z=765.94], ro['Bat'/111017, l='MpServer', x=-1183.77, y=50.76, z=827.37], ro['Bat'/110311, l='MpServer', x=-1247.88, y=19.10, z=805.75], ro['Bat'/110885, l='MpServer', x=-1172.47, y=58.00, z=796.25], ro['Bat'/111116, l='MpServer', x=-1218.66, y=17.48, z=756.25], sc['Squid'/110981, l='MpServer', x=-1115.72, y=58.88, z=823.28], rz['Sheep'/85304, l='MpServer', x=-1183.75, y=72.00, z=798.63], rz['Sheep'/85305, l='MpServer', x=-1174.66, y=69.00, z=789.44], sc['Squid'/110982, l='MpServer', x=-1121.47, y=61.34, z=829.44], sc['Squid'/110984, l='MpServer', x=-1130.63, y=59.09, z=718.31], rz['Sheep'/85302, l='MpServer', x=-1198.75, y=64.00, z=794.03], sc['Squid'/110986, l='MpServer', x=-1127.31, y=60.16, z=709.16], rz['Sheep'/85303, l='MpServer', x=-1198.84, y=64.00, z=795.34], rz['Sheep'/102870, l='MpServer', x=-1109.66, y=78.00, z=760.50], rz['Sheep'/102871, l='MpServer', x=-1108.94, y=65.00, z=770.09], rz['Sheep'/102276, l='MpServer', x=-1152.50, y=72.00, z=785.94], su['entity.MinecartChest.name'/102277, l='MpServer', x=-1159.50, y=13.50, z=810.50], su['entity.MinecartChest.name'/102275, l='MpServer', x=-1161.50, y=19.50, z=791.50]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bdd.a(SourceFile:284)
	at atv.b(SourceFile:1761)
	at atv.d(SourceFile:628)
	at net.minecraft.client.main.Main.main(SourceFile:101)

-- System Details --
Details:
	Minecraft Version: 1.6.4
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_17, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 95146256 bytes (90 MB) / 351850496 bytes (335 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 1047 (58632 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
	Launched Version: 1.6.4
	LWJGL: 2.9.0
	OpenGL: AMD Radeon(TM) HD 6380G GL version 4.1.11156 Compatibility Profile Context, ATI Technologies Inc.
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Pack: Sexy Pack.zip
	Current Language: English (UK)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 2324 (130144 bytes; 0 MB) allocated, 16 (896 bytes; 0 MB) used

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-190644/12395391/