In one of my worlds, my game encountered a crash upon taking a screenshot. Then, the game consistently crashes upon reloading the world. I've gone back through multiple versions trying to load the world. Every version following 1.7.2, starting with 1.7.3-pre, crashes upon loading. The crash does not occur when loading in 1.7.2 or earlier, though I only tested with the 1.7 versions.

Report #1 (Screenshot)

---- Minecraft Crash Report ----
// I'm sorry, Dave.

Time: 8/29/14 2:00 AM
Description: Exception in server tick loop

java.lang.IllegalArgumentException: n must be positive
at java.util.Random.nextInt(Unknown Source)
at arw.a(SourceFile:153)
at arw.a(SourceFile:49)
at ark.a(SourceFile:389)
at bgt.a(SourceFile:472)
at qs.a(SourceFile:174)
at bff.a(SourceFile:870)
at qs.c(SourceFile:104)
at qr.<init>(SourceFile:39)
at qq.a(SourceFile:231)
at qq.a(SourceFile:408)
at sn.a(SourceFile:813)
at cyi.y(SourceFile:159)
at net.minecraft.server.MinecraftServer.run(SourceFile:447)
at java.lang.Thread.run(Unknown Source)

Report #2 (Loading World)

---- Minecraft Crash Report ----
// Hey, that tickles! Hehehe!

Time: 8/29/14 2:16 AM
Description: Ticking memory connection

java.lang.IllegalArgumentException: n must be positive
at java.util.Random.nextInt(Unknown Source)
at arw.a(SourceFile:153)
at arw.a(SourceFile:49)
at ark.a(SourceFile:389)
at bgt.a(SourceFile:472)
at qs.a(SourceFile:174)
at bff.a(SourceFile:870)
at qs.c(SourceFile:104)
at qr.<init>(SourceFile:39)
at qq.a(SourceFile:231)
at qq.a(SourceFile:263)
at sn.a(SourceFile:225)
at sn.c(SourceFile:277)
at sn.a(SourceFile:132)
at rq.b(SourceFile:96)
at rq.c(SourceFile:54)
at gr.a(SourceFile:187)
at rc.c(SourceFile:151)
at net.minecraft.server.MinecraftServer.z(SourceFile:625)
at net.minecraft.server.MinecraftServer.y(SourceFile:531)
at cyi.y(SourceFile:155)
at net.minecraft.server.MinecraftServer.run(SourceFile:447)
at java.lang.Thread.run(Unknown Source)

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 arw.a(SourceFile:153)
at arw.a(SourceFile:49)
at ark.a(SourceFile:389)
at bgt.a(SourceFile:472)
at qs.a(SourceFile:174)
at bff.a(SourceFile:870)
at qs.c(SourceFile:104)
at qr.<init>(SourceFile:39)
at qq.a(SourceFile:231)
at qq.a(SourceFile:263)
at sn.a(SourceFile:225)
at sn.c(SourceFile:277)
at sn.a(SourceFile:132)
at rq.b(SourceFile:96)
at rq.c(SourceFile:54)
at gr.a(SourceFile:187)

– Ticking connection –
Details:
Connection: gr@6355ad25
Stacktrace:
at rc.c(SourceFile:151)
at net.minecraft.server.MinecraftServer.z(SourceFile:625)
at net.minecraft.server.MinecraftServer.y(SourceFile:531)
at cyi.y(SourceFile:155)
at net.minecraft.server.MinecraftServer.run(SourceFile:447)
at java.lang.Thread.run(Unknown Source)