Hopper: java.lang.NullPointerException: Exception generating new chunk

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-465253/

Crash:

java.lang.NullPointerException: Exception generating new chunk
	at apl.a(SourceFile:165)
	at apl.d(SourceFile:195)

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

---- Minecraft Crash Report ----
// Why did you do that?

Time: 25/10/13 11:40 AM
Description: Exception generating new chunk

java.lang.NullPointerException: Exception generating new chunk
	at apl.a(SourceFile:165)
	at apl.d(SourceFile:195)
	at mi.c(SourceFile:78)
	at mi.d(SourceFile:108)
	at afn.e(SourceFile:311)
	at afn.a(SourceFile:249)
	at agb.b(SourceFile:85)
	at agb.a(SourceFile:50)
	at ld.a(SourceFile:439)
	at ld.a(SourceFile:371)
	at mm.b(SourceFile:362)
	at qn.C(SourceFile:331)
	at rh.C(SourceFile:168)
	at qn.h(SourceFile:294)
	at rh.h(SourceFile:1178)
	at xl.h(SourceFile:240)
	at mm.i(SourceFile:207)
	at mx.a(SourceFile:209)
	at ir.a(SourceFile:137)
	at it.a(SourceFile:20)
	at ef.a(SourceFile:164)
	at ms.c(SourceFile:134)
	at net.minecraft.server.MinecraftServer.u(SourceFile:529)
	at net.minecraft.server.MinecraftServer.t(SourceFile:441)
	at bsk.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 apl.a(SourceFile:165)
	at apl.d(SourceFile:195)

-- Chunk to be generated --
Details:
	Location: 108,107
	Position hash: 459561500780
	Generator: RandomLevelSource
Stacktrace:
	at mi.c(SourceFile:78)
	at mi.d(SourceFile:108)
	at afn.e(SourceFile:311)

-- Requested block coordinates --
Details:
	Found chunk: true
	Location: World: (1728,255,1712), Chunk: (at 0,15,0 in 108,107; contains blocks 1728,0,1712 to 1743,255,1727), Region: (3,3; contains chunks 96,96 to 127,127, blocks 1536,0,1536 to 2047,255,2047)
Stacktrace:
	at afn.a(SourceFile:249)
	at agb.b(SourceFile:85)
	at agb.a(SourceFile:50)
	at ld.a(SourceFile:439)
	at ld.a(SourceFile:371)
	at mm.b(SourceFile:362)
	at qn.C(SourceFile:331)
	at rh.C(SourceFile:168)
	at qn.h(SourceFile:294)
	at rh.h(SourceFile:1178)
	at xl.h(SourceFile:240)

-- Player being ticked --
Details:
	Entity Type: null (mm)
	Entity ID: 267
	Entity Name: lc20348
	Entity's Exact location: 1856.00, 90.84, 1705.00
	Entity's Block location: World: (1856,90,1705), Chunk: (at 0,5,9 in 116,106; contains blocks 1856,0,1696 to 1871,255,1711), Region: (3,3; contains chunks 96,96 to 127,127, blocks 1536,0,1536 to 2047,255,2047)
	Entity's Momentum: 0.00, 0.00, 0.00
Stacktrace:
	at mm.i(SourceFile:207)
	at mx.a(SourceFile:209)
	at ir.a(SourceFile:137)
	at it.a(SourceFile:20)
	at ef.a(SourceFile:164)

-- Ticking connection --
Details:
	Connection: ef@87363b
Stacktrace:
	at ms.c(SourceFile:134)
	at net.minecraft.server.MinecraftServer.u(SourceFile:529)
	at net.minecraft.server.MinecraftServer.t(SourceFile:441)
	at bsk.t(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:358)
	at ky.run(SourceFile:617)

-- System Details --
Details:
	Minecraft Version: 1.7.2
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_07, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 218475288 bytes (208 MB) / 361533440 bytes (344 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 2315 (129640 bytes; 0 MB) allocated, 2122 (118832 bytes; 0 MB) used
	IntCache: cache: 1, tcache: 21, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 94 (5264 bytes; 0 MB) allocated, 94 (5264 bytes; 0 MB) used
	Player Count: 1 / 8; [mm['lc20348'/267, l='New World', x=1856.00, y=90.84, z=1705.00]]
	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-465253/21367650/