[MC-53540] Bug Crash

What I expected to happen was...:
Being able to play Minecraft via Lan with one (1) other person.

What actually happened was...:
Minecraft crashed when clicked on "Open to Lan", attempted several times and to no avail. Minecraft also begun to crash when just playing individually, no Lan, singleplayer mode. Now crashes on start up.

Steps to Reproduce:
1. Click play on Minecraft launcher 1.3.11
2. Click Singleplayer and select "ex" world
3. If just starting the world does not crash,
then click "Open to Lan"

Attachment
Files will be needed in order to recreate the crash.
FIles are as provided.

CRASH REPORT VERSION 1

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

Time: 4/24/14 10:10 PM
Description: Unexpected error

java.lang.ArrayIndexOutOfBoundsException
	at java.lang.System.arraycopy(Native Method)
	at apw.a(SourceFile:890)
	at bln.a(SourceFile:852)
	at gz.a(SourceFile:150)
	at gz.a(SourceFile:13)
	at ej.a(SourceFile:174)
	at blq.e(SourceFile:212)
	at ban.p(SourceFile:1306)
	at ban.ak(SourceFile:774)
	at ban.f(SourceFile:728)
	at net.minecraft.client.main.Main.main(SourceFile:148)


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

-- Head --
Stacktrace:
	at java.lang.System.arraycopy(Native Method)
	at apw.a(SourceFile:890)
	at bln.a(SourceFile:852)
	at gz.a(SourceFile:150)
	at gz.a(SourceFile:13)
	at ej.a(SourceFile:174)
	at blq.e(SourceFile:212)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [blw['canria'/165, l='MpServer', x=144.54, y=64.62, z=316.63]]
	Chunk stats: MultiplayerChunkCache: 257, 257
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (114,64,267), Chunk: (at 2,4,11 in 7,16; contains blocks 112,0,256 to 127,255,271), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 472040 game time, 6427 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: 25 total; [xy['Creeper'/137, l='MpServer', x=194.50, y=21.00, z=361.50], wf['Chicken'/68, l='MpServer', x=73.59, y=62.45, z=294.41], xy['Creeper'/136, l='MpServer', x=196.50, y=21.00, z=359.50], xy['Creeper'/139, l='MpServer', x=200.50, y=21.00, z=358.50], xy['Creeper'/138, l='MpServer', x=195.50, y=21.00, z=362.50], wf['Chicken'/72, l='MpServer', x=85.19, y=63.00, z=254.78], xj['item.item.egg'/73, l='MpServer', x=85.22, y=63.13, z=255.66], xy['Creeper'/135, l='MpServer', x=195.50, y=23.00, z=280.50], wf['Chicken'/74, l='MpServer', x=83.81, y=62.61, z=277.38], xj['item.item.egg'/75, l='MpServer', x=84.13, y=56.13, z=277.69], yp['Zombie'/81, l='MpServer', x=103.25, y=35.00, z=349.25], yk['Skeleton'/83, l='MpServer', x=97.99, y=35.00, z=352.73], yk['Skeleton'/82, l='MpServer', x=101.50, y=36.00, z=351.50], wd['Bat'/89, l='MpServer', x=137.25, y=53.10, z=285.25], yk['Skeleton'/88, l='MpServer', x=142.50, y=30.00, z=264.50], yp['Zombie'/91, l='MpServer', x=137.94, y=52.00, z=287.38], wd['Bat'/90, l='MpServer', x=137.25, y=53.10, z=287.75], blw['canria'/165, l='MpServer', x=144.54, y=64.62, z=316.63], wd['Bat'/425, l='MpServer', x=204.50, y=21.00, z=354.50], wd['Bat'/424, l='MpServer', x=215.50, y=21.00, z=352.50], xz['Enderman'/116, l='MpServer', x=151.69, y=50.00, z=288.16], xz['Enderman'/115, l='MpServer', x=149.84, y=50.00, z=288.41], wd['Bat'/428, l='MpServer', x=209.50, y=21.00, z=351.50], yl['Slime'/114, l='MpServer', x=155.69, y=25.00, z=277.69], wd['Bat'/422, l='MpServer', x=208.50, y=21.00, z=352.50]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at blr.a(SourceFile:289)
	at ban.b(SourceFile:1972)
	at ban.f(SourceFile:742)
	at net.minecraft.client.main.Main.main(SourceFile:148)

-- System Details --
Details:
	Minecraft Version: 1.7.9
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_55, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 50484608 bytes (48 MB) / 174895104 bytes (166 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	IntCache: cache: 2, tcache: 31, allocated: 11, tallocated: 64
	Launched Version: 1.7.9
	LWJGL: 2.9.1
	OpenGL: Intel(R) HD Graphics Family GL version 3.1.0 - Build 8.15.10.2476, Intel
	GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Anisotropic Filtering: Off (1)

CRASH REPORT VERSION 2

---- Minecraft Crash Report ----
// Hi. I'm Minecraft, and I'm a crashaholic.

Time: 4/24/14 10:11 PM
Description: Exception ticking world

java.lang.ArrayIndexOutOfBoundsException: 1022
	at apu.a(SourceFile:26)
	at apy.b(SourceFile:75)
	at apw.c(SourceFile:386)
	at aha.e(SourceFile:353)
	at alv.e(SourceFile:78)
	at akq.a(SourceFile:23)
	at ms.g(SourceFile:289)
	at ms.b(SourceFile:137)
	at net.minecraft.server.MinecraftServer.v(SourceFile:514)
	at net.minecraft.server.MinecraftServer.u(SourceFile:453)
	at bvj.u(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:369)
	at li.run(SourceFile:628)


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

-- Head --
Stacktrace:
	at apu.a(SourceFile:26)
	at apy.b(SourceFile:75)
	at apw.c(SourceFile:386)
	at aha.e(SourceFile:353)
	at alv.e(SourceFile:78)
	at akq.a(SourceFile:23)
	at ms.g(SourceFile:289)
	at ms.b(SourceFile:137)

-- Affected level --
Details:
	Level name: ex
	All players: 1 total; [mv['canria'/164, l='ex', x=144.87, y=63.00, z=315.93]]
	Chunk stats: ServerChunkCache: 625 Drop: 0
	Level seed: -2796854282876563425
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (114,64,267), Chunk: (at 2,4,11 in 7,16; contains blocks 112,0,256 to 127,255,271), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 472060 game time, 6447 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 62359 (now: false), thunder time: 63122 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.v(SourceFile:514)
	at net.minecraft.server.MinecraftServer.u(SourceFile:453)
	at bvj.u(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:369)
	at li.run(SourceFile:628)

-- System Details --
Details:
	Minecraft Version: 1.7.9
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_55, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 75010728 bytes (71 MB) / 174792704 bytes (166 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Player Count: 1 / 8; [mv['canria'/164, l='ex', x=144.87, y=63.00, z=315.93]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.