I was playing a map made by somebody, then clicked this button which was supposed to teleport me (using a command block) as soon as I clicked it, the game crashed, this is the crash report:

---- Minecraft Crash Report ----
// Hi. I'm Minecraft, and I'm a crashaholic.

Time: 12/22/13 10:31 AM
Description: Ticking memory connection

java.lang.IllegalArgumentException: n must be positive
at java.util.Random.nextInt(Unknown Source)
at agr.a(SourceFile:122)
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:122)
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@645acd60
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_45, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 319145240 bytes (304 MB) / 451411968 bytes (430 MB) up to 954728448 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
AABB Pool Size: 29 (1624 bytes; 0 MB) allocated, 29 (1624 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
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['OrangeLouis'/0, l='ParcourMap', x=-2518.50, y=66.50, z=37.50]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.