Hopper: java.lang.NullPointerException: Getting biome

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-434794/

Crash:

java.lang.NullPointerException: Getting biome
	at aoh.a(SourceFile:934)

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

---- Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.

Time: 10/21/13 12:17 PM
Description: Getting biome

java.lang.NullPointerException: Getting biome
	at aoh.a(SourceFile:934)
	at afl.a(SourceFile:116)
	at apj.a(SourceFile:481)
	at mi.a(SourceFile:228)
	at mj.a(SourceFile:156)
	at afy.a(SourceFile:118)
	at mj.b(SourceFile:117)
	at net.minecraft.server.MinecraftServer.u(SourceFile:503)
	at net.minecraft.server.MinecraftServer.t(SourceFile:441)
	at bsg.t(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:358)
	at ky.run(SourceFile:617)


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

-- Head --
Stacktrace:
	at aoh.a(SourceFile:934)

-- Coordinates of biome request --
Details:
	Location: World: (46,0,122), Chunk: (at 14,0,10 in 2,7; contains blocks 32,0,112 to 47,255,127), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Stacktrace:
	at afl.a(SourceFile:116)
	at apj.a(SourceFile:481)
	at mi.a(SourceFile:228)
	at mj.a(SourceFile:156)
	at afy.a(SourceFile:118)
	at mj.b(SourceFile:117)

-- Affected level --
Details:
	Level name: Songs and other stuff
	All players: 1 total; [mm['busybusybee72'/162675, l='Songs and other stuff', x=0.50, y=128.00, z=0.50]]
	Chunk stats: ServerChunkCache: 625 Drop: 0
	Level seed: -6009781683459596288
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (0,129,0), Chunk: (at 0,8,0 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: 46 game time, 46 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 40436 (now: false), thunder time: 141597 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
	at net.minecraft.server.MinecraftServer.u(SourceFile:503)
	at net.minecraft.server.MinecraftServer.t(SourceFile:441)
	at bsg.t(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:358)
	at ky.run(SourceFile:617)

-- System Details --
Details:
	Minecraft Version: 13w43a
	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), Oracle Corporation
	Memory: 195397440 bytes (186 MB) / 468611072 bytes (446 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 130 (7280 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 12 (672 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Player Count: 1 / 8; [mm['busybusybee72'/162675, l='Songs and other stuff', x=0.50, y=128.00, z=0.50]]
	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-434794/20346553/