Hopper: java.lang.IllegalStateException: Already tesselating!

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-83682/

Crash:

java.lang.IllegalStateException: Already tesselating!
	at bfn.b(SourceFile:171)
	at bfn.b(SourceFile:166)
	at bfo.a(SourceFile:6807)
	at bgz.a(SourceFile:110)
	at bha.a(SourceFile:10)
	at bha.a(SourceFile:7)
	at bgz.a(SourceFile:89)
	at bgz.a(SourceFile:15)

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

---- Minecraft Crash Report ----
// Who set us up the TNT?

Time: 06.09.13 15:16
Description: Rendering entity in world

java.lang.IllegalStateException: Already tesselating!
	at bfn.b(SourceFile:171)
	at bfn.b(SourceFile:166)
	at bfo.a(SourceFile:6807)
	at bgz.a(SourceFile:110)
	at bha.a(SourceFile:10)
	at bha.a(SourceFile:7)
	at bgz.a(SourceFile:89)
	at bgz.a(SourceFile:15)
	at bgi.a(SourceFile:204)
	at bgi.a(SourceFile:184)
	at bfi.a(SourceFile:326)
	at bfb.a(SourceFile:845)
	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 bfo.a(SourceFile:6807)
	at bgz.a(SourceFile:110)
	at bha.a(SourceFile:10)
	at bha.a(SourceFile:7)
	at bgz.a(SourceFile:89)
	at bgz.a(SourceFile:15)

-- Entity being rendered --
Details:
	Entity Type: MinecartSpawner (sy)
	Entity ID: 7
	Entity Name: entity.MinecartSpawner.name
	Entity's Exact location: -8,50, 5,34, -6,50
	Entity's Block location: World: (-9,5,-7), Chunk: (at 7,0,9 in -1,-1; contains blocks -16,0,-16 to -1,255,-1), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Entity's Momentum: 0,00, 0,00, 0,00

-- Renderer details --
Details:
	Assigned renderer: bha@15264db
	Location: -12,24,-6,32,-17,63 - World: (-13,-7,-18), Chunk: (at 3,-1,14 in -1,-2; contains blocks -16,0,-32 to -1,255,-17), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Rotation: 0.0
	Delta: 0.89815134
Stacktrace:
	at bgi.a(SourceFile:204)
	at bgi.a(SourceFile:184)
	at bfi.a(SourceFile:326)
	at bfb.a(SourceFile:845)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bdf['Dampf_Nudel'/0, l='MpServer', x=3,74, y=11,66, z=11,13]]
	Chunk stats: MultiplayerChunkCache: 441
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (1439,4,1077), Chunk: (at 15,0,5 in 89,67; contains blocks 1424,0,1072 to 1439,255,1087), Region: (2,2; contains chunks 64,64 to 95,95, blocks 1024,0,1024 to 1535,255,1535)
	Level time: 3719096 game time, 64250 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: adventure (ID 2). Hardcore: false. Cheats: false
	Forced entities: 27 total; [oc['entity.ItemFrame.name'/1, l='MpServer', x=-27,50, y=22,50, z=3,94], oc['entity.ItemFrame.name'/2, l='MpServer', x=-28,50, y=22,50, z=3,94], bdf['Dampf_Nudel'/0, l='MpServer', x=3,74, y=11,66, z=11,13], oc['entity.ItemFrame.name'/4, l='MpServer', x=-27,50, y=22,50, z=-2,94], oc['entity.ItemFrame.name'/5, l='MpServer', x=-28,50, y=22,50, z=-2,94], sy['entity.MinecartSpawner.name'/6, l='MpServer', x=-14,50, y=5,34, z=-6,28], sy['entity.MinecartSpawner.name'/7, l='MpServer', x=-8,50, y=5,34, z=-6,50], rr['Pferd'/8, l='MpServer', x=-11,47, y=21,00, z=-6,56], sy['entity.MinecartSpawner.name'/9, l='MpServer', x=-14,50, y=5,34, z=7,50], rr['Pferd'/11, l='MpServer', x=-11,28, y=21,00, z=7,19], oc['entity.ItemFrame.name'/12, l='MpServer', x=-0,50, y=44,50, z=13,94], oc['entity.ItemFrame.name'/13, l='MpServer', x=-0,50, y=43,50, z=13,94], oc['entity.ItemFrame.name'/14, l='MpServer', x=-0,50, y=45,50, z=13,94], sy['entity.MinecartSpawner.name'/15, l='MpServer', x=10,50, y=5,34, z=-6,50], oc['entity.ItemFrame.name'/17, l='MpServer', x=1,50, y=43,50, z=13,94], oc['entity.ItemFrame.name'/19, l='MpServer', x=1,50, y=45,50, z=13,94], oc['entity.ItemFrame.name'/18, l='MpServer', x=1,50, y=44,50, z=13,94], oc['entity.ItemFrame.name'/21, l='MpServer', x=0,50, y=43,50, z=13,94], oc['entity.ItemFrame.name'/20, l='MpServer', x=0,50, y=45,50, z=13,94], oc['entity.ItemFrame.name'/23, l='MpServer', x=29,50, y=22,50, z=-2,94], sy['entity.MinecartSpawner.name'/22, l='MpServer', x=16,50, y=5,34, z=-6,50], sy['entity.MinecartSpawner.name'/25, l='MpServer', x=16,50, y=5,34, z=7,50], oc['entity.ItemFrame.name'/24, l='MpServer', x=28,50, y=22,50, z=-2,94], oc['entity.ItemFrame.name'/27, l='MpServer', x=29,50, y=22,50, z=3,94], oc['entity.ItemFrame.name'/26, l='MpServer', x=28,50, y=22,50, z=3,94], sy['entity.MinecartSpawner.name'/76176, l='MpServer', x=-8,50, y=5,34, z=7,50], sy['entity.MinecartSpawner.name'/77171, l='MpServer', x=10,50, y=5,34, z=7,50]]
	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:628)
	at net.minecraft.client.main.Main.main(SourceFile:101)

-- System Details --
Details:
	Minecraft Version: 1.6.2
	Operating System: Windows Vista (x86) version 6.0
	Java Version: 1.6.0_22, Sun Microsystems Inc.
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Sun Microsystems Inc.
	Memory: 2678792 bytes (2 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: 0, tallocated: 0
	Launched Version: 1.6.2
	LWJGL: 2.9.0
	OpenGL: GeForce 7650 GS/PCIe/SSE2 GL version 2.1.2, NVIDIA Corporation
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Pack: CloudCraft-162.zip
	Current Language: Deutsch (Deutschland)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 21 (1176 bytes; 0 MB) allocated, 21 (1176 bytes; 0 MB) used

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-83682/8323191/