crash

---- Minecraft Crash Report ----
// Daisy, daisy...

Time: 21.2.2014 10:22
Description: Ticking memory connection

java.lang.IllegalArgumentException: n must be positive
	at java.util.Random.nextInt(Unknown Source)
	at agr.a(SourceFile:169)
	at agr.a(SourceFile:27)
	at agl.a(SourceFile:364)
	at apq.a(SourceFile:432)
	at ml.a(SourceFile:160)
	at aoo.a(SourceFile:781)
	at ml.c(SourceFile:95)
	at mk.<init>(SourceFile:36)
	at mj.a(SourceFile:217)
	at mj.a(SourceFile:254)
	at lg.a(SourceFile:155)
	at lg.c(SourceFile:206)
	at lg.a(SourceFile:100)
	at ng.c(SourceFile:87)
	at ng.a(SourceFile:52)
	at ef.a(SourceFile:166)
	at mv.c(SourceFile:134)
	at net.minecraft.server.MinecraftServer.u(SourceFile:528)
	at net.minecraft.server.MinecraftServer.t(SourceFile:440)
	at btk.t(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:357)
	at lb.run(SourceFile:616)


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 agr.a(SourceFile:169)
	at agr.a(SourceFile:27)
	at agl.a(SourceFile:364)
	at apq.a(SourceFile:432)
	at ml.a(SourceFile:160)
	at aoo.a(SourceFile:781)
	at ml.c(SourceFile:95)
	at mk.<init>(SourceFile:36)
	at mj.a(SourceFile:217)
	at mj.a(SourceFile:254)
	at lg.a(SourceFile:155)
	at lg.c(SourceFile:206)
	at lg.a(SourceFile:100)
	at ng.c(SourceFile:87)
	at ng.a(SourceFile:52)
	at ef.a(SourceFile:166)

-- Ticking connection --
Details:
	Connection: ef@30b078b0
Stacktrace:
	at mv.c(SourceFile:134)
	at net.minecraft.server.MinecraftServer.u(SourceFile:528)
	at net.minecraft.server.MinecraftServer.t(SourceFile:440)
	at btk.t(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:357)
	at lb.run(SourceFile:616)

-- System Details --
Details:
	Minecraft Version: 1.7.4
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_51, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 185586032 bytes (176 MB) / 332398592 bytes (317 MB) up to 3817865216 bytes (3641 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx4G
	AABB Pool Size: 2 (112 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Player Count: 1 / 8; [mp['Lamkac'/18, l='Underground 2', x=-433,34, y=249,00, z=1255,90]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.