Hopper: java.lang.NullPointerException (SourceFile:197)

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-299/

Crash:

java.lang.NullPointerException
	at aln.f(SourceFile:197)
	at hm.m(SourceFile:669)
	at net.minecraft.server.MinecraftServer.a(SourceFile:873)
	at bkw.a(SourceFile:198)
	at mu.b(SourceFile:94)
	at net.minecraft.server.MinecraftServer.s(SourceFile:433)
	at bkw.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:339)
	at hh.run(SourceFile:582)

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

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

Time: 8/2/13 8:30 AM
Description: Exception in server tick loop

java.lang.NullPointerException
	at aln.f(SourceFile:197)
	at hm.m(SourceFile:669)
	at net.minecraft.server.MinecraftServer.a(SourceFile:873)
	at bkw.a(SourceFile:198)
	at mu.b(SourceFile:94)
	at net.minecraft.server.MinecraftServer.s(SourceFile:433)
	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:
---------------------------------------------------------------------------------------

-- System Details --
Details:
	Minecraft Version: 1.6.2
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.6.0_25, Sun Microsystems Inc.
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
	Memory: 242150768 bytes (230 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: 11122 (622832 bytes; 0 MB) allocated, 2155 (120680 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 1906 (106736 bytes; 0 MB) allocated, 246 (13776 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-299/19999/