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-467286/

Crash:

java.lang.IllegalArgumentException: n must be positive
	at java.util.Random.nextInt(Unknown Source)
	at agm.a(SourceFile:130)
	at agm.a(SourceFile:27)
	at agg.a(SourceFile:362)
	at ago.a(SourceFile:29)
	at apl.a(SourceFile:432)
	at mi.a(SourceFile:160)
	at aoj.a(SourceFile:781)
	at mi.c(SourceFile:95)
	at mh.<init>(SourceFile:31)
	at mg.a(SourceFile:212)
	at mg.a(SourceFile:249)
	at ld.a(SourceFile:155)
	at ld.c(SourceFile:206)
	at ld.a(SourceFile:100)
	at nd.c(SourceFile:87)
	at nd.a(SourceFile:52)
	at ef.a(SourceFile:166)

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

---- Minecraft Crash Report ----
// On the bright side, I bought you a teddy bear!

Time: 10/25/13 1:02 PM
Description: Ticking memory connection

java.lang.IllegalArgumentException: n must be positive
	at java.util.Random.nextInt(Unknown Source)
	at agm.a(SourceFile:130)
	at agm.a(SourceFile:27)
	at agg.a(SourceFile:362)
	at ago.a(SourceFile:29)
	at apl.a(SourceFile:432)
	at mi.a(SourceFile:160)
	at aoj.a(SourceFile:781)
	at mi.c(SourceFile:95)
	at mh.<init>(SourceFile:31)
	at mg.a(SourceFile:212)
	at mg.a(SourceFile:249)
	at ld.a(SourceFile:155)
	at ld.c(SourceFile:206)
	at ld.a(SourceFile:100)
	at nd.c(SourceFile:87)
	at nd.a(SourceFile:52)
	at ef.a(SourceFile:166)
	at ms.c(SourceFile:134)
	at net.minecraft.server.MinecraftServer.u(SourceFile:529)
	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:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at java.util.Random.nextInt(Unknown Source)
	at agm.a(SourceFile:130)
	at agm.a(SourceFile:27)
	at agg.a(SourceFile:362)
	at ago.a(SourceFile:29)
	at apl.a(SourceFile:432)
	at mi.a(SourceFile:160)
	at aoj.a(SourceFile:781)
	at mi.c(SourceFile:95)
	at mh.<init>(SourceFile:31)
	at mg.a(SourceFile:212)
	at mg.a(SourceFile:249)
	at ld.a(SourceFile:155)
	at ld.c(SourceFile:206)
	at ld.a(SourceFile:100)
	at nd.c(SourceFile:87)
	at nd.a(SourceFile:52)
	at ef.a(SourceFile:166)

-- Ticking connection --
Details:
	Connection: ef@6a1023
Stacktrace:
	at ms.c(SourceFile:134)
	at net.minecraft.server.MinecraftServer.u(SourceFile:529)
	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)

-- System Details --
Details:
	Minecraft Version: 1.7.2
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_10, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 24342936 bytes (23 MB) / 78991360 bytes (75 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 33 (1848 bytes; 0 MB) allocated, 33 (1848 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 29, tallocated: 77
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 4 (224 bytes; 0 MB) allocated, 4 (224 bytes; 0 MB) used
	Player Count: 1 / 8; [mm['skillfulfun'/57, l='New Skyblock', x=-250.81, y=64.54, z=110.85]]
	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-467286/21418902/