java.lang.StackOverflowError while trying to acess "Customize" from Superflat world option

I was using the minecraft snapshot 17w15a, and while i tried to create a new superflat world, when i click on the "Customize" button it throws an exception by "StackOverflow" and the game crashes.

Here's the stack:
The exception report comes from bgu.class
Reported exception thrown!
f: Rendering screen
at btj.a(SourceFile:1104)
at bgu.aw(SourceFile:982)
at bgu.a(SourceFile:399)
at net.minecraft.client.main.Main.main(SourceFile:123)
Caused by: java.lang.StackOverflowError
at byo.a(SourceFile:306)
at byo.a(SourceFile:306)
at byo.a(SourceFile:306)
at byo.a(SourceFile:306)

PS: the "at byo.a(SourceFile:306)" repeats over 1000 times on the stack (literally)!

And it happens all the time i try to customize a superflat world.