Hopper: java.lang.ArrayIndexOutOfBoundsException: -5

java.lang.ArrayIndexOutOfBoundsException: -5
	at b.a(SourceFile:263)
	at afn.a(SourceFile:2553)
	at net.minecraft.server.MinecraftServer.u(SourceFile:514)
	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)

---- Minecraft Crash Report ----
// This is a token for 1 free hug. Redeem at your nearest Mojangsta: [~~HUG~~]

Time: 25/10/13 18:41
Description: Exception in server tick loop

java.lang.ArrayIndexOutOfBoundsException: -5
	at b.a(SourceFile:263)
	at afn.a(SourceFile:2553)
	at net.minecraft.server.MinecraftServer.u(SourceFile:514)
	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:
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-- System Details --
Details:
	Minecraft Version: 1.7.2
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.6.0_20, Sun Microsystems Inc.
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
	Memory: 7650080 bytes (7 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: 1276 (71456 bytes; 0 MB) allocated, 1027 (57512 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 3970 (222320 bytes; 0 MB) allocated, 3970 (222320 bytes; 0 MB) used
	Player Count: 1 / 8; [mm['omnomzilla'/6733916, l='New World', x=79.50, y=16.00, z=-498.50]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.