Hang on water world creation

I start minecraft, select 'create new world', select template 'water world', start the creation and it hangs. The game just hangs and do not respond.

[0524/111809:INFO:GameCallbacks.cpp(178)] game/net.minecraft.server.MinecraftServer (Server thread) error Encountered an unexpected exception
java.lang.NullPointerException
	at bby.a(SourceFile:479)
	at brn.g(SourceFile:85)
	at brn.<init>(SourceFile:60)
	at bqa$$Lambda$917/502381892.create(Unknown Source)
	at bqa.create(SourceFile:50)
	at brd.n(SourceFile:81)
	at sk.p(SourceFile:598)
	at sk.<init>(SourceFile:131)
	at dii.a(SourceFile:97)
	at dii.d(SourceFile:132)
	at net.minecraft.server.MinecraftServer.run(SourceFile:502)
	at java.lang.Thread.run(Thread.java:745)