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So im having quite the odd crash on 1.7, no mods, although there have been mods used on the map in the past (they were unloaded in 1.6.4 b4 trying in 1.7). But once i enter the mech storage facility i get this crash.. and i've done a once over.. but cant find any conflicting blocks in that area.. ugh.. plz help!

Description: Exception ticking world

java.lang.IllegalArgumentException: n must be positive
at java.util.Random.nextInt(Unknown Source)
at agx.a(SourceFile:122)
at agx.a(SourceFile:27)
at agr.a(SourceFile:364)
at ahh.a(SourceFile:57)
at apw.a(SourceFile:432)
at mr.a(SourceFile:165)
at aou.a(SourceFile:778)
at mr.c(SourceFile:100)
at mr.d(SourceFile:113)
at afy.e(SourceFile:309)
at ms.g(SourceFile:233)
at ms.b(SourceFile:136)
at net.minecraft.server.MinecraftServer.v(SourceFile:504)
at net.minecraft.server.MinecraftServer.u(SourceFile:443)
at btq.u(SourceFile:117)
at net.minecraft.server.MinecraftServer.run(SourceFile:359)
at lh.run(SourceFile:618)


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 agx.a(SourceFile:122)
at agx.a(SourceFile:27)
at agr.a(SourceFile:364)
at ahh.a(SourceFile:57)
at apw.a(SourceFile:432)
at mr.a(SourceFile:165)
at aou.a(SourceFile:778)
at mr.c(SourceFile:100)
at mr.d(SourceFile:113)
at afy.e(SourceFile:309)
at ms.g(SourceFile:233)
at ms.b(SourceFile:136)

-- Affected level --
Details:
Level name: YogLabs
All players: 1 total; [mv['Ju5T'/504, l='YogLabs', x=-944.14, y=108.18, z=-986.53]]
Chunk stats: ServerChunkCache: 790 Drop: 0
Level seed: -8949195842031224265
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: World: (-769,69,-972), Chunk: (at 15,4,4 in -49,-61; contains blocks -784,0,-976 to -769,255,-961), Region: (-2,-2; contains chunks -64,-64 to -33,-33, blocks -1024,0,-1024 to -513,255,-513)
Level time: 37838325 game time, 323381 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 78694 (now: false), thunder time: 59725 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.v(SourceFile:504)
at net.minecraft.server.MinecraftServer.u(SourceFile:443)
at btq.u(SourceFile:117)
at net.minecraft.server.MinecraftServer.run(SourceFile:359)
at lh.run(SourceFile:618)