[MC-45884] Crash on world creation

I started the snapshot wanting to test some new features with villagers, so I got a seed with a village nearby. (This seed if it affects anything: 8273570472534601379 )

The minecraft window stopped at the attached screen, and the launcher that I always keep open said this:

17:46:23 INFO]: Client> [17:46:23] [Server thread/INFO]: Starting integrated minecraft server version 14w04b
[17:46:23 INFO]: Client> [17:46:23] [Server thread/INFO]: Generating keypair
[17:46:24 INFO]: Client> [17:46:24] [Server thread/INFO]: Converting map!
[17:46:24 INFO]: Client> [17:46:24] [Server thread/INFO]: Scanning folders...
[17:46:24 INFO]: Client> [17:46:24] [Server thread/INFO]: Total conversion count is 0
[17:46:24 INFO]: Client> [17:46:24] [Server thread/INFO]: Preparing start region for level 0
[17:46:25 INFO]: Client> [17:46:25] [Server thread/INFO]: Preparing spawn area: 4%
[17:46:25 INFO]: Client> [17:46:25] [Server thread/ERROR]: Encountered an unexpected exception
[17:46:25 INFO]: Client> q: Exception getting block type in world
[17:46:25 INFO]: Client> 	at ahn.c(SourceFile:213) ~[14w04b.jar:?]
[17:46:25 INFO]: Client> 	at ahn.d(SourceFile:219) ~[14w04b.jar:?]
[17:46:25 INFO]: Client> 	at aso.a(SourceFile:28) ~[14w04b.jar:?]
[17:46:25 INFO]: Client> 	at ail.a(SourceFile:141) ~[14w04b.jar:?]
[17:46:25 INFO]: Client> 	at ail.a(SourceFile:27) ~[14w04b.jar:?]
[17:46:25 INFO]: Client> 	at aif.a(SourceFile:386) ~[14w04b.jar:?]
[17:46:25 INFO]: Client> 	at ain.a(SourceFile:29) ~[14w04b.jar:?]
[17:46:25 INFO]: Client> 	at asc.a(SourceFile:443) ~[14w04b.jar:?]
[17:46:25 INFO]: Client> 	at nl.a(SourceFile:174) ~[14w04b.jar:?]
[17:46:25 INFO]: Client> 	at aqz.a(SourceFile:854) ~[14w04b.jar:?]
[17:46:25 INFO]: Client> 	at nl.c(SourceFile:103) ~[14w04b.jar:?]
[17:46:25 INFO]: Client> 	at net.minecraft.server.MinecraftServer.h(SourceFile:257) ~[14w04b.jar:?]
[17:46:25 INFO]: Client> 	at bym.a(SourceFile:89) ~[14w04b.jar:?]
[17:46:25 INFO]: Client> 	at bym.f(SourceFile:105) ~[14w04b.jar:?]
[17:46:25 INFO]: Client> 	at net.minecraft.server.MinecraftServer.run(SourceFile:347) [14w04b.jar:?]
[17:46:25 INFO]: Client> 	at mc.run(SourceFile:647) [14w04b.jar:?]
[17:46:25 INFO]: Client> Caused by: java.lang.RuntimeException: Already decorating
[17:46:25 INFO]: Client> 	at ail.a(SourceFile:21) ~[14w04b.jar:?]
[17:46:25 INFO]: Client> 	at aif.a(SourceFile:386) ~[14w04b.jar:?]
[17:46:25 INFO]: Client> 	at ain.a(SourceFile:29) ~[14w04b.jar:?]
[17:46:25 INFO]: Client> 	at asc.a(SourceFile:443) ~[14w04b.jar:?]
[17:46:25 INFO]: Client> 	at nl.a(SourceFile:174) ~[14w04b.jar:?]
[17:46:25 INFO]: Client> 	at aqz.a(SourceFile:850) ~[14w04b.jar:?]
[17:46:25 INFO]: Client> 	at nl.c(SourceFile:103) ~[14w04b.jar:?]
[17:46:25 INFO]: Client> 	at nl.d(SourceFile:116) ~[14w04b.jar:?]
[17:46:25 INFO]: Client> 	at ahn.b(SourceFile:273) ~[14w04b.jar:?]
[17:46:25 INFO]: Client> 	at ahn.f(SourceFile:268) ~[14w04b.jar:?]
[17:46:25 INFO]: Client> 	at ahn.c(SourceFile:204) ~[14w04b.jar:?]
[17:46:25 INFO]: Client> 	... 15 more
[17:46:25 INFO]: Client> [17:46:25] [Server thread/ERROR]: This crash report has been saved to: C:\Users\Tyler\AppData\Roaming\.minecraft\crash-reports\crash-2014-01-24_17.46.25-server.txt

*Edit: Attacked the crash report instead*