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Here is the crash report:

---- Minecraft Crash Report ----
// I blame Dinnerbone.

Time: 7/8/13 3:23 PM
Description: Manually triggered debug crash

java.lang.Throwable
	at ats.k(SourceFile:1238)
	at ats.S(SourceFile:663)
	at ats.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:
---------------------------------------------------------------------------------------

-- Affected level --
Details:
	Level name: MpServer
	All players: 2 total; [bdf['willkurr'/402446, l='MpServer', x=-598.04, y=5.62, z=-311.32], bev['monkeybubbles256'/58, l='MpServer', x=-593.72, y=4.70, z=-321.59]]
	Chunk stats: MultiplayerChunkCache: 441
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-572,4,-317), Chunk: (at 4,0,3 in -36,-20; contains blocks -576,0,-320 to -561,255,-305), Region: (-2,-1; contains chunks -64,-32 to -33,-1, blocks -1024,0,-512 to -513,255,-1)
	Level time: 298194 game time, 4269 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: 49 total; [bdf['willkurr'/402446, l='MpServer', x=-598.04, y=5.62, z=-311.32], rn['Bat'/312866, l='MpServer', x=-591.66, y=22.10, z=-296.50], rq['Cow'/8, l='MpServer', x=-661.09, y=4.00, z=-323.94], ry['Sheep'/9, l='MpServer', x=-671.97, y=4.00, z=-285.94], rx['Pig'/10, l='MpServer', x=-609.14, y=4.00, z=-330.87], rx['Pig'/11, l='MpServer', x=-643.97, y=4.00, z=-307.97], rx['Pig'/12, l='MpServer', x=-619.81, y=4.00, z=-347.78], ry['Sheep'/13, l='MpServer', x=-593.78, y=4.00, z=-378.81], rx['Pig'/14, l='MpServer', x=-604.13, y=4.00, z=-383.03], se['Sparro'/15, l='MpServer', x=-595.94, y=4.00, z=-316.78], oc['entity.ItemFrame.name'/17, l='MpServer', x=-602.94, y=6.50, z=-299.50], rw['entity.Cat.name'/16, l='MpServer', x=-596.69, y=4.00, z=-315.59], rn['Bat'/389919, l='MpServer', x=-605.27, y=4.03, z=-303.06], oc['entity.ItemFrame.name'/19, l='MpServer', x=-602.94, y=6.50, z=-300.50], oc['entity.ItemFrame.name'/18, l='MpServer', x=-602.94, y=5.50, z=-299.50], oc['entity.ItemFrame.name'/21, l='MpServer', x=-602.94, y=6.50, z=-302.50], oc['entity.ItemFrame.name'/20, l='MpServer', x=-602.94, y=5.50, z=-300.50], oc['entity.ItemFrame.name'/23, l='MpServer', x=-602.94, y=6.50, z=-298.50], oc['entity.ItemFrame.name'/22, l='MpServer', x=-602.94, y=6.50, z=-301.50], oc['entity.ItemFrame.name'/25, l='MpServer', x=-602.94, y=5.50, z=-301.50], oc['entity.ItemFrame.name'/24, l='MpServer', x=-602.94, y=5.50, z=-298.50], oc['entity.ItemFrame.name'/26, l='MpServer', x=-602.94, y=5.50, z=-302.50], rn['Bat'/400933, l='MpServer', x=-593.31, y=10.10, z=-296.00], bev['monkeybubbles256'/58, l='MpServer', x=-593.72, y=4.70, z=-321.59], rr['Horse'/35, l='MpServer', x=-593.72, y=4.00, z=-321.59], rn['Bat'/396132, l='MpServer', x=-599.64, y=13.63, z=-294.03], rn['Bat'/396131, l='MpServer', x=-590.53, y=22.10, z=-288.25], rn['Bat'/401046, l='MpServer', x=-590.53, y=21.98, z=-288.50], rr['Horse'/36, l='MpServer', x=-590.25, y=4.00, z=-320.78], rn['Bat'/401049, l='MpServer', x=-592.69, y=22.10, z=-291.59], rn['Bat'/401053, l='MpServer', x=-591.41, y=13.00, z=-288.19], rn['Bat'/375059, l='MpServer', x=-595.53, y=10.10, z=-288.25], rn['Bat'/396137, l='MpServer', x=-592.50, y=11.07, z=-287.28], sr['item.item.egg'/377917, l='MpServer', x=-533.34, y=4.13, z=-296.88], rp['Chicken'/55, l='MpServer', x=-533.44, y=4.00, z=-298.41], rp['Chicken'/54, l='MpServer', x=-530.63, y=4.00, z=-302.63], bev['monkeybubbles256'/58, l='MpServer', x=-593.72, y=4.70, z=-321.59], rp['Chicken'/57, l='MpServer', x=-522.47, y=4.00, z=-304.44], rp['Chicken'/56, l='MpServer', x=-538.47, y=4.00, z=-298.53], rn['Bat'/382206, l='MpServer', x=-591.75, y=12.70, z=-290.00], rn['Bat'/399072, l='MpServer', x=-592.47, y=13.79, z=-288.25], rn['Bat'/399073, l='MpServer', x=-605.36, y=20.60, z=-288.09], rn['Bat'/373724, l='MpServer', x=-601.03, y=10.10, z=-290.84], rn['Bat'/373725, l='MpServer', x=-589.25, y=10.10, z=-288.25], rn['Bat'/373726, l='MpServer', x=-589.53, y=10.10, z=-291.25], rn['Bat'/373723, l='MpServer', x=-596.50, y=10.10, z=-288.25], sr['item.item.egg'/403383, l='MpServer', x=-537.31, y=4.13, z=-297.81], rn['Bat'/399071, l='MpServer', x=-589.94, y=13.23, z=-288.08], rn['Bat'/399069, l='MpServer', x=-593.88, y=16.20, z=-297.32]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Non-integrated multiplayer server
Stacktrace:
	at bda.a(SourceFile:284)
	at ats.b(SourceFile:1761)
	at ats.d(SourceFile:628)
	at net.minecraft.client.main.Main.main(SourceFile:101)

-- System Details --
Details:
	Minecraft Version: 1.6.2
	Operating System: Mac OS X (i386) version 10.6.8
	Java Version: 1.6.0_51, Apple Inc.
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Apple Inc.
	Memory: 33086552 bytes (31 MB) / 81125376 bytes (77 MB) up to 1070399488 bytes (1020 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 4700 (263200 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 1.6.2
	LWJGL: 2.9.0
	OpenGL: Intel GMA 950 OpenGL Engine GL version 1.4 APPLE-1.6.36, Intel Inc.
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Pack: Default
	Current Language: English (UK)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 99 (5544 bytes; 0 MB) allocated, 18 (1008 bytes; 0 MB) used

???

Is anyone working on this bug?

I have discovered that this only happens in a LAN world.

I've been waiting for someone to answer me for about 35 minutes now...

HELLOOOOOOOOOO? IS ANYBODY HOME? 😞

Duplicate of MC-23928, please use the search function to see if your bug has already been submitted. Currently over 58% of tickets are being closed as duplicate.

Here is a screen shot just to be sure

I am very sure.