Hopper: java.lang.IllegalStateException: Already tesselating!

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-16867/

Crash:

java.lang.IllegalStateException: Already tesselating!
	at bfn.b(SourceFile:171)
	at bfn.b(SourceFile:166)
	at bee.a(SourceFile:98)
	at bfb.a(SourceFile:852)

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

---- Minecraft Crash Report ----
// Daisy, daisy...

Time: 8/15/13 8:53 AM
Description: Unexpected error

java.lang.IllegalStateException: Already tesselating!
	at bfn.b(SourceFile:171)
	at bfn.b(SourceFile:166)
	at bee.a(SourceFile:98)
	at bfb.a(SourceFile:852)
	at bfb.b(SourceFile:693)
	at ats.S(SourceFile:686)
	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:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at bfn.b(SourceFile:171)
	at bfn.b(SourceFile:166)
	at bee.a(SourceFile:98)
	at bfb.a(SourceFile:852)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bdf['rcpower'/3887108, l='MpServer', x=-44.70, y=43.62, z=67.27]]
	Chunk stats: MultiplayerChunkCache: 180
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (8,64,8), Chunk: (at 8,4,8 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 7403165 game time, 1225777 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: 2 total; [bdf['rcpower'/3887108, l='MpServer', x=-44.70, y=43.62, z=67.27], sx['entity.MinecartRideable.name'/4266380, l='MpServer', x=-63.50, y=42.50, z=75.50]]
	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:633)
	at net.minecraft.client.main.Main.main(SourceFile:101)

-- System Details --
Details:
	Minecraft Version: 1.6.2
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 12579280 bytes (11 MB) / 518979584 bytes (494 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 2 (112 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: 1.6.2
	LWJGL: 2.9.0
	OpenGL: AMD Radeon HD 6310 Graphics   GL version 4.1.10834 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: Default
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 28 (1568 bytes; 0 MB) allocated, 28 (1568 bytes; 0 MB) used

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-16867/3083057/