Hopper: java.lang.IllegalArgumentException: n must be positive

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-319558/

Crash:

java.lang.IllegalArgumentException: n must be positive
	at java.util.Random.nextInt(Unknown Source)
	at age.a(SourceFile:122)
	at age.a(SourceFile:27)
	at afy.a(SourceFile:354)
	at agt.a(SourceFile:74)
	at aox.a(SourceFile:432)
	at mb.a(SourceFile:160)
	at anv.a(SourceFile:781)
	at mb.c(SourceFile:95)
	at ma.<init>(SourceFile:31)
	at lz.a(SourceFile:212)
	at lz.a(SourceFile:249)
	at ky.a(SourceFile:156)
	at ky.c(SourceFile:207)
	at ky.a(SourceFile:101)
	at mu.c(SourceFile:89)
	at mu.a(SourceFile:54)
	at ek.a(SourceFile:148)

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

---- Minecraft Crash Report ----
// Sorry :(

Time: 10/11/13 7:51 PM
Description: Ticking memory connection

java.lang.IllegalArgumentException: n must be positive
	at java.util.Random.nextInt(Unknown Source)
	at age.a(SourceFile:122)
	at age.a(SourceFile:27)
	at afy.a(SourceFile:354)
	at agt.a(SourceFile:74)
	at aox.a(SourceFile:432)
	at mb.a(SourceFile:160)
	at anv.a(SourceFile:781)
	at mb.c(SourceFile:95)
	at ma.<init>(SourceFile:31)
	at lz.a(SourceFile:212)
	at lz.a(SourceFile:249)
	at ky.a(SourceFile:156)
	at ky.c(SourceFile:207)
	at ky.a(SourceFile:101)
	at mu.c(SourceFile:89)
	at mu.a(SourceFile:54)
	at ek.a(SourceFile:148)
	at ml.c(SourceFile:134)
	at net.minecraft.server.MinecraftServer.u(SourceFile:529)
	at net.minecraft.server.MinecraftServer.t(SourceFile:441)
	at brh.t(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:358)
	at kt.run(SourceFile:617)


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

-- Head --
Stacktrace:
	at java.util.Random.nextInt(Unknown Source)
	at age.a(SourceFile:122)
	at age.a(SourceFile:27)
	at afy.a(SourceFile:354)
	at agt.a(SourceFile:74)
	at aox.a(SourceFile:432)
	at mb.a(SourceFile:160)
	at anv.a(SourceFile:781)
	at mb.c(SourceFile:95)
	at ma.<init>(SourceFile:31)
	at lz.a(SourceFile:212)
	at lz.a(SourceFile:249)
	at ky.a(SourceFile:156)
	at ky.c(SourceFile:207)
	at ky.a(SourceFile:101)
	at mu.c(SourceFile:89)
	at mu.a(SourceFile:54)
	at ek.a(SourceFile:148)

-- Ticking connection --
Details:
	Connection: ek@78a92483
Stacktrace:
	at ml.c(SourceFile:134)
	at net.minecraft.server.MinecraftServer.u(SourceFile:529)
	at net.minecraft.server.MinecraftServer.t(SourceFile:441)
	at brh.t(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:358)
	at kt.run(SourceFile:617)

-- System Details --
Details:
	Minecraft Version: 13w41b
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_04, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 85484304 bytes (81 MB) / 193527808 bytes (184 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 384 (21504 bytes; 0 MB) allocated, 360 (20160 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 102
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 41 (2296 bytes; 0 MB) allocated, 41 (2296 bytes; 0 MB) used
	Player Count: 1 / 8; [mf['Cornllama'/482, l='River', x=-353.33, y=145.94, z=70.43]]
	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-319558/16993055/