Minecraft Slime Block Lag Crash

---- Minecraft Crash Report ----
// Why is it breaking :(

Time: 1/12/14 9:25 PM
Description: Unexpected error

java.lang.IllegalStateException: Already tesselating!
	at bot.a(SourceFile:167)
	at bot.b(SourceFile:162)
	at bom.a(SourceFile:933)
	at bof.a(SourceFile:1019)
	at bof.b(SourceFile:873)
	at bax.ah(SourceFile:791)
	at bax.f(SourceFile:718)
	at net.minecraft.client.main.Main.main(SourceFile:154)


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

-- Head --
Stacktrace:
	at bot.a(SourceFile:167)
	at bot.b(SourceFile:162)
	at bom.a(SourceFile:933)
	at bof.a(SourceFile:1019)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [blv['Nortrix0'/5, l='MpServer', x=-1458.17, y=51.62, z=627.81]]
	Chunk stats: MultiplayerChunkCache: 169, 169
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options:
	Level spawn location: -1459.00,4.00,626.00 - World: (-1459,4,626), Chunk: (at 13,0,2 in -92,39; contains blocks -1472,0,624 to -1457,255,639), Region: (-3,1; contains chunks -96,32 to -65,63, blocks -1536,0,512 to -1025,255,1023)
	Level time: 5098 game time, 5098 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: survival (ID 0). Hardcore: false. Cheats: false
	Forced entities: 2 total; [blv['Nortrix0'/5, l='MpServer', x=-1455.10, y=51.62, z=621.66], blv['Nortrix0'/5, l='MpServer', x=-1458.17, y=51.62, z=627.81]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Non-integrated multiplayer server
Stacktrace:
	at blq.a(SourceFile:298)
	at bax.b(SourceFile:2013)
	at bax.f(SourceFile:732)
	at net.minecraft.client.main.Main.main(SourceFile:154)

-- System Details --
Details:
	Minecraft Version: 14w02c
	Operating System: Windows 8 (amd64) version 6.2
	Java Version: 1.7.0_45, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 105206504 bytes (100 MB) / 978321408 bytes (933 MB) up to 978321408 bytes (933 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 14w02c
	LWJGL: 2.9.1
	OpenGL: Intel(R) HD Graphics GL version 4.0.0 - Build 10.18.10.3308, 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)
	Anisotropic Filtering: On (8)