Hopper: java.lang.RuntimeException: Already decorating!!

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-50601/

Crash:

java.lang.RuntimeException: Already decorating!!
	at act.a(SourceFile:21)
	at acp.a(SourceFile:217)
	at adb.a(SourceFile:48)
	at aes.a(SourceFile:454)
	at jq.a(SourceFile:168)
	at adq.a(SourceFile:726)
	at jq.c(SourceFile:105)
	at jq.d(SourceFile:116)
	at abv.e(SourceFile:289)

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

---- Minecraft Crash Report ----
// Quite honestly, I wouldn't worry myself about that.

Time: 16/08/13 19:39
Description: Exception getting block type in world

java.lang.RuntimeException: Already decorating!!
	at act.a(SourceFile:21)
	at acp.a(SourceFile:217)
	at adb.a(SourceFile:48)
	at aes.a(SourceFile:454)
	at jq.a(SourceFile:168)
	at adq.a(SourceFile:726)
	at jq.c(SourceFile:105)
	at jq.d(SourceFile:116)
	at abv.e(SourceFile:289)
	at abv.a(SourceFile:213)
	at abv.g(SourceFile:464)
	at abv.f(SourceFile:449)
	at abv.d(SourceFile:415)
	at abv.f(SourceFile:316)
	at abv.i(SourceFile:378)
	at aop.k(SourceFile:46)
	at aop.a(SourceFile:35)
	at jr.a(SourceFile:404)
	at jr.b(SourceFile:130)
	at net.minecraft.server.MinecraftServer.t(SourceFile:462)
	at net.minecraft.server.MinecraftServer.s(SourceFile:405)
	at bkw.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:339)
	at hh.run(SourceFile:582)


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

-- Head --
Stacktrace:
	at act.a(SourceFile:21)
	at acp.a(SourceFile:217)
	at adb.a(SourceFile:48)
	at aes.a(SourceFile:454)
	at jq.a(SourceFile:168)
	at adq.a(SourceFile:726)
	at jq.c(SourceFile:105)
	at jq.d(SourceFile:116)
	at abv.e(SourceFile:289)

-- Requested block coordinates --
Details:
	Found chunk: true
	Location: World: (-208,27,431), Chunk: (at 0,1,15 in -13,26; contains blocks -208,0,416 to -193,255,431), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Stacktrace:
	at abv.a(SourceFile:213)
	at abv.g(SourceFile:464)
	at abv.f(SourceFile:449)
	at abv.d(SourceFile:415)
	at abv.f(SourceFile:316)
	at abv.i(SourceFile:378)
	at aop.k(SourceFile:46)
	at aop.a(SourceFile:35)

-- Block being ticked --
Details:
	Block type: ID #13 (tile.gravel // aol)
	Block data value: 0 / 0x0 / 0b0000
	Block location: World: (-208,27,432), Chunk: (at 0,1,0 in -13,27; contains blocks -208,0,432 to -193,255,447), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Stacktrace:
	at jr.a(SourceFile:404)
	at jr.b(SourceFile:130)

-- Affected level --
Details:
	Level name: Ohis Epic Survival 2
	All players: 0 total; []
	Chunk stats: ServerChunkCache: 432 Drop: 0
	Level seed: -1247654283
	Level generator: ID 02 - largeBiomes, ver 0. Features enabled: true
	Level generator options: 
	Level spawn location: World: (-120,64,256), Chunk: (at 8,4,0 in -8,16; contains blocks -128,0,256 to -113,255,271), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 85 game time, 85 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 40488 (now: false), thunder time: 176072 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.t(SourceFile:462)
	at net.minecraft.server.MinecraftServer.s(SourceFile:405)
	at bkw.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:339)
	at hh.run(SourceFile:582)

-- System Details --
Details:
	Minecraft Version: 1.6.2
	Operating System: Windows 8 (x86) version 6.2
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 256924656 bytes (245 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: 6052 (338912 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 2, tcache: 0, allocated: 1, tallocated: 71
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 2323 (130088 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Player Count: 0 / 8; []
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-50601/3387895/