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-83360/

Crash:

java.lang.IllegalArgumentException: n must be positive
	at java.util.Random.nextInt(Random.java:300)
	at adu.a(SourceFile:121)
	at adu.a(SourceFile:26)
	at ado.a(SourceFile:350)
	at adz.a(SourceFile:141)
	at agb.a(SourceFile:433)
	at kc.a(SourceFile:156)
	at aey.a(SourceFile:765)
	at kc.c(SourceFile:93)
	at kc.d(SourceFile:104)
	at act.e(SourceFile:297)
	at kd.g(SourceFile:231)
	at kd.b(SourceFile:134)

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

---- Minecraft Crash Report ----
// I bet Cylons wouldn't have this problem.

Time: 06.09.13 14:36
Description: Exception ticking world

java.lang.IllegalArgumentException: n must be positive
	at java.util.Random.nextInt(Random.java:300)
	at adu.a(SourceFile:121)
	at adu.a(SourceFile:26)
	at ado.a(SourceFile:350)
	at adz.a(SourceFile:141)
	at agb.a(SourceFile:433)
	at kc.a(SourceFile:156)
	at aey.a(SourceFile:765)
	at kc.c(SourceFile:93)
	at kc.d(SourceFile:104)
	at act.e(SourceFile:297)
	at kd.g(SourceFile:231)
	at kd.b(SourceFile:134)
	at net.minecraft.server.MinecraftServer.t(SourceFile:455)
	at net.minecraft.server.MinecraftServer.s(SourceFile:398)
	at bng.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:332)
	at hs.run(SourceFile:575)


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

-- Head --
Stacktrace:
	at java.util.Random.nextInt(Random.java:300)
	at adu.a(SourceFile:121)
	at adu.a(SourceFile:26)
	at ado.a(SourceFile:350)
	at adz.a(SourceFile:141)
	at agb.a(SourceFile:433)
	at kc.a(SourceFile:156)
	at aey.a(SourceFile:765)
	at kc.c(SourceFile:93)
	at kc.d(SourceFile:104)
	at act.e(SourceFile:297)
	at kd.g(SourceFile:231)
	at kd.b(SourceFile:134)

-- Affected level --
Details:
	Level name: Omg!It's-
	All players: 1 total; [kg['morslofs'/310, l='Omg!It's-', x=29999999,50, y=150,50, z=20000000,50]]
	Chunk stats: ServerChunkCache: 908 Drop: 0
	Level seed: 5117738848372596016
	Level generator: ID 03 - amplified, ver 0. Features enabled: true
	Level generator options: 
	Level spawn location: World: (132,64,144), Chunk: (at 4,4,0 in 8,9; contains blocks 128,0,144 to 143,255,159), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 10783 game time, 10783 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 72908 (now: false), thunder time: 91704 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.t(SourceFile:455)
	at net.minecraft.server.MinecraftServer.s(SourceFile:398)
	at bng.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:332)
	at hs.run(SourceFile:575)

-- System Details --
Details:
	Minecraft Version: 13w36a
	Operating System: Linux (amd64) version 3.8.0-30-generic
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 329783064 bytes (314 MB) / 609550336 bytes (581 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 7950 (445200 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Suspicious classes: [com.ibm.icu.impl.UBiDiProps, Authenticate, ICUData, ...], [com.ibm.icu.lang.ECharacterCategory, ECharacterDirection, UCharacter], [com.ibm.icu.text.ArabicShapingException, Bidi, ImpTabPair, ...], [com.ibm.icu.util.ValueIterator, RangeValueIterator], [gnu.trove.TIntCollection], [gnu.trove.impl.HashFunctions, PrimeFinder], [gnu.trove.impl.hash.THash, TPrimitiveHash, TIntIntHash], [gnu.trove.iterator.TIterator, TAdvancingIterator, TIntIntIterator], [gnu.trove.map.TIntIntMap], [gnu.trove.map.hash.TIntIntHashMap], [gnu.trove.procedure.TIntIntProcedure], [gnu.trove.set.TIntSet]
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 7240 (405440 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Player Count: 1 / 8; [kg['morslofs'/310, l='Omg!It's-', x=29999999,50, y=150,50, z=20000000,50]]
	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-83360/8315241/