Creating a superflat world with transparent blocks will hang at "converting world"

Superflat preset: 2;63x0,166;1;stronghold,biome_1,village,decoration,dungeon,lake,mineshaft,lava_lake
also tried with Glass and Dirt in place of Barriers and also 64 layers of glass, ones made of entirely solid blocks do not crash
Generation:
http://pastebin.com/pVZxRK3F (had to be put on pastebin since the character limit was exceeded)
Loading world:
http://pastebin.com/4VPV89yr
It should also be noted that closing with Task Manager at this point leaves the game's javaw process running.

[16:17:39 INFO]: Client> [16:17:39] [Server thread/ERROR]: Encountered an unexpected exception
[16:17:39 INFO]: Client> s: Exception getting block type in world
[16:17:39 INFO]: Client> 	at nu.a(SourceFile:583) ~[14w06b.jar:?]
[16:17:39 INFO]: Client> 	at cbr.a(SourceFile:77) ~[14w06b.jar:?]
[16:17:39 INFO]: Client> 	at cbr.f(SourceFile:107) ~[14w06b.jar:?]
[16:17:39 INFO]: Client> 	at net.minecraft.server.MinecraftServer.run(SourceFile:347) [14w06b.jar:?]
[16:17:39 INFO]: Client> 	at mk.run(SourceFile:647) [14w06b.jar:?]
[16:17:39 INFO]: Client> Caused by: java.lang.IllegalArgumentException: n must be positive
[16:17:39 INFO]: Client> 	at java.util.Random.nextInt(Unknown Source) ~[?:1.7.0_15]
[16:17:39 INFO]: Client> 	at ajs.a(SourceFile:131) ~[14w06b.jar:?]
[16:17:39 INFO]: Client> 	at ajs.a(SourceFile:27) ~[14w06b.jar:?]
[16:17:39 INFO]: Client> 	at ajl.a(SourceFile:392) ~[14w06b.jar:?]
[16:17:39 INFO]: Client> 	at akh.a(SourceFile:74) ~[14w06b.jar:?]
[16:17:39 INFO]: Client> 	at atf.a(SourceFile:173) ~[14w06b.jar:?]
[16:17:39 INFO]: Client> 	at nt.a(SourceFile:175) ~[14w06b.jar:?]
[16:17:39 INFO]: Client> 	at ash.a(SourceFile:850) ~[14w06b.jar:?]