Hopper: java.lang.NullPointerException: Getting biome

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-83869/

Crash:

java.lang.NullPointerException
	at aez.a(SourceFile:927)

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

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

Time: 6-9-13 21:57
Description: Getting biome

java.lang.NullPointerException
	at aez.a(SourceFile:927)
	at act.a(SourceFile:101)
	at adj.a(SourceFile:166)
	at arc.c(SourceFile:83)
	at bic.p(SourceFile:3783)
	at bic.b(SourceFile:122)
	at bhk.a(SourceFile:158)
	at bhv.a(SourceFile:1132)
	at bho.a(SourceFile:817)
	at bho.b(SourceFile:697)
	at awb.V(SourceFile:713)
	at awb.e(SourceFile:642)
	at net.minecraft.client.main.Main.main(SourceFile:103)


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

-- Head --
Stacktrace:
	at aez.a(SourceFile:927)

-- Coordinates of biome request --
Details:
	Location: World: (-1681,0,7536), Chunk: (at 15,0,0 in -106,471; contains blocks -1696,0,7536 to -1681,255,7551), Region: (-4,14; contains chunks -128,448 to -97,479, blocks -2048,0,7168 to -1537,255,7679)
Stacktrace:
	at act.a(SourceFile:101)
	at adj.a(SourceFile:166)
	at arc.c(SourceFile:83)
	at bic.p(SourceFile:3783)
	at bic.b(SourceFile:122)
	at bhk.a(SourceFile:158)
	at bhv.a(SourceFile:1132)
	at bho.a(SourceFile:817)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bfn['Maarten359'/237, l='MpServer', x=-1680,43, y=64,74, z=7542,32]]
	Chunk stats: MultiplayerChunkCache: 5, 5
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (208,64,252), Chunk: (at 0,4,12 in 13,15; contains blocks 208,0,240 to 223,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 90379 game time, 7000 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; [bfn['Maarten359'/237, l='MpServer', x=-1680,43, y=64,74, z=7542,32], un['Zombie'/332, l='MpServer', x=-1673,50, y=33,00, z=7559,50]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bfi.a(SourceFile:285)
	at awb.b(SourceFile:1813)
	at awb.e(SourceFile:651)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 13w36b
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_17, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 65261056 bytes (62 MB) / 344981504 bytes (329 MB) up to 1908932608 bytes (1820 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G
	AABB Pool Size: 18931 (1060136 bytes; 1 MB) allocated, 15 (840 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Launched Version: 13w36b
	LWJGL: 2.9.0
	OpenGL: AMD Radeon(TM) HD 6520G             GL version 4.1.10600 Compatibility Profile Context, ATI Technologies Inc.
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: [Maarten's Pack-converted]
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 145 (8120 bytes; 0 MB) allocated, 39 (2184 bytes; 0 MB) used

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-83869/8422427/