Hopper: java.lang.IndexOutOfBoundsException: Index: 84, Size: 45

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-466048/

Crash:

java.lang.IndexOutOfBoundsException: Index: 84, Size: 45
	at java.util.ArrayList.rangeCheck(Unknown Source)
	at java.util.ArrayList.get(Unknown Source)
	at ye.a(SourceFile:313)
	at biy.a(SourceFile:308)
	at bdd.a(SourceFile:490)
	at bdd.a(SourceFile:503)
	at bcd.l(SourceFile:258)
	at bcd.k(SourceFile:217)

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

---- Minecraft Crash Report ----
// I'm sorry, Dave.

Time: 10/25/13 3:23 PM
Description: Updating screen events

java.lang.IndexOutOfBoundsException: Index: 84, Size: 45
	at java.util.ArrayList.rangeCheck(Unknown Source)
	at java.util.ArrayList.get(Unknown Source)
	at ye.a(SourceFile:313)
	at biy.a(SourceFile:308)
	at bdd.a(SourceFile:490)
	at bdd.a(SourceFile:503)
	at bcd.l(SourceFile:258)
	at bcd.k(SourceFile:217)
	at azd.o(SourceFile:1303)
	at azd.ad(SourceFile:753)
	at azd.e(SourceFile:704)
	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 java.util.ArrayList.rangeCheck(Unknown Source)
	at java.util.ArrayList.get(Unknown Source)
	at ye.a(SourceFile:313)
	at biy.a(SourceFile:308)
	at bdd.a(SourceFile:490)
	at bdd.a(SourceFile:503)
	at bcd.l(SourceFile:258)
	at bcd.k(SourceFile:217)

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

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bje['Zack_Thao'/27, l='MpServer', x=-786.30, y=17.62, z=-1907.07]]
	Chunk stats: MultiplayerChunkCache: 256, 256
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-753,4,-1922), Chunk: (at 15,0,14 in -48,-121; contains blocks -768,0,-1936 to -753,255,-1921), Region: (-2,-4; contains chunks -64,-128 to -33,-97, blocks -1024,0,-2048 to -513,255,-1537)
	Level time: 103877 game time, 125388 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: 19 total; [vb['Sheep'/5, l='MpServer', x=-862.84, y=4.00, z=-1963.84], vb['Sheep'/8, l='MpServer', x=-835.28, y=4.00, z=-1960.50], vb['Sheep'/9, l='MpServer', x=-839.09, y=4.00, z=-1956.78], vb['Sheep'/10, l='MpServer', x=-834.50, y=4.00, z=-1952.50], vb['Sheep'/11, l='MpServer', x=-822.06, y=4.00, z=-1964.06], vh['cute dog'/12, l='MpServer', x=-800.59, y=4.00, z=-1908.34], vh['cute dog'/13, l='MpServer', x=-784.47, y=4.00, z=-1905.72], vh['cute dog'/14, l='MpServer', x=-790.50, y=4.00, z=-1911.25], vh['cute dog'/15, l='MpServer', x=-763.84, y=4.00, z=-1930.44], va['jeffry'/17, l='MpServer', x=-792.53, y=16.00, z=-1899.47], uu['favorite '/16, l='MpServer', x=-799.66, y=4.00, z=-1896.22], va['jeffry'/19, l='MpServer', x=-791.47, y=16.00, z=-1900.44], va['jeffry'/18, l='MpServer', x=-792.53, y=16.00, z=-1901.53], uq['dillon'/21, l='MpServer', x=-785.25, y=17.10, z=-1899.38], uq['dillon'/20, l='MpServer', x=-785.25, y=17.10, z=-1899.25], va['jeffry'/23, l='MpServer', x=-780.78, y=12.00, z=-1903.91], uq['dillon'/22, l='MpServer', x=-786.75, y=17.10, z=-1899.25], uq['dillon'/24, l='MpServer', x=-779.81, y=6.10, z=-1901.38], bje['Zack_Thao'/27, l='MpServer', x=-786.30, y=17.62, z=-1907.07]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at biz.a(SourceFile:284)
	at azd.b(SourceFile:1951)
	at azd.e(SourceFile:713)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 1.7.2
	Operating System: Windows 8 (x86) version 6.2
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 109374952 bytes (104 MB) / 349646848 bytes (333 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 2062 (115472 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 1.7.2
	LWJGL: 2.9.0
	OpenGL: Intel(R) HD Graphics GL version 3.1.0 - Build 9.17.10.2932, Intel
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: English (UK)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 172 (9632 bytes; 0 MB) allocated, 24 (1344 bytes; 0 MB) used
	Anisotropic Filtering: Off (1)

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-466048/21490964/