Hopper: java.lang.ArrayIndexOutOfBoundsException: -1

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-1464240/

Crash:

java.lang.ArrayIndexOutOfBoundsException: -1
	at java.util.ArrayList.fastRemove(Unknown Source)
	at java.util.ArrayList.remove(Unknown Source)
	at nx.b(SourceFile:62)
	at nw.c(SourceFile:328)
	at pn.e(SourceFile:251)
	at on.a(SourceFile:455)
	at oi.c(SourceFile:130)
	at net.minecraft.server.MinecraftServer.w(SourceFile:565)
	at net.minecraft.server.MinecraftServer.v(SourceFile:481)
	at cek.v(SourceFile:128)
	at net.minecraft.server.MinecraftServer.run(SourceFile:397)
	at mq.run(SourceFile:667)

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

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

Time: 3/13/14 9:55 AM
Description: Exception in server tick loop

java.lang.ArrayIndexOutOfBoundsException: -1
	at java.util.ArrayList.fastRemove(Unknown Source)
	at java.util.ArrayList.remove(Unknown Source)
	at nx.b(SourceFile:62)
	at nw.c(SourceFile:328)
	at pn.e(SourceFile:251)
	at on.a(SourceFile:455)
	at oi.c(SourceFile:130)
	at net.minecraft.server.MinecraftServer.w(SourceFile:565)
	at net.minecraft.server.MinecraftServer.v(SourceFile:481)
	at cek.v(SourceFile:128)
	at net.minecraft.server.MinecraftServer.run(SourceFile:397)
	at mq.run(SourceFile:667)


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

-- System Details --
Details:
	Minecraft Version: 14w11a
	Operating System: Windows 8 (x86) version 6.2
	Java Version: 1.7.0_51, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 122163840 bytes (116 MB) / 309686272 bytes (295 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
	Profiler Position: N/A (disabled)
	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-1464240/67528162/