Hopper: java.lang.NullPointerException

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-25396/

Crash:

java.lang.NullPointerException
	at aen.d(SourceFile:95)

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

---- Minecraft Crash Report ----
// I just don't know what went wrong :(

Time: 8/4/13 5:50 PM
Description: Exception generating new chunk

java.lang.NullPointerException
	at aen.d(SourceFile:95)
	at jq.c(SourceFile:84)
	at jp.<init>(SourceFile:29)
	at jo.a(SourceFile:208)
	at jo.d(SourceFile:337)
	at hm.d(SourceFile:197)
	at jz.a(SourceFile:267)
	at et.a(SourceFile:136)
	at cm.b(SourceFile:64)
	at jz.e(SourceFile:60)
	at kc.b(SourceFile:37)
	at bkz.b(SourceFile:84)
	at net.minecraft.server.MinecraftServer.t(SourceFile:488)
	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 aen.d(SourceFile:95)

-- Chunk to be generated --
Details:
	Location: 13,-10
	Position hash: -42949672947
	Generator: FlatLevelSource
Stacktrace:
	at jq.c(SourceFile:84)
	at jp.<init>(SourceFile:29)
	at jo.a(SourceFile:208)
	at jo.d(SourceFile:337)
	at hm.d(SourceFile:197)
	at jz.a(SourceFile:267)
	at et.a(SourceFile:136)
	at cm.b(SourceFile:64)
	at jz.e(SourceFile:60)

-- Ticking connection --
Details:
	Connection: jz@606240
Stacktrace:
	at kc.b(SourceFile:37)
	at bkz.b(SourceFile:84)
	at net.minecraft.server.MinecraftServer.t(SourceFile:488)
	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 7 (x86) version 6.1
	Java Version: 1.7.0_17, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 16926192 bytes (16 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: 815 (45640 bytes; 0 MB) allocated, 186 (10416 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 440 (24640 bytes; 0 MB) allocated, 426 (23856 bytes; 0 MB) used
	Player Count: 1 / 8; [ju['Villagecreep'/27264, l='New World', x=48.01, y=97.65, z=7.99]]
	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-25396/585871/