[MC-90221] Not generated world in Minecraft

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What I expected to happen was...:
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What actually happened was...:
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java.lang.NullPointerException: Rendering screen
	at axl$a.a(SourceFile:124)
	at awi.b(SourceFile:392)
	at awi.a(SourceFile:211)
	at axl.a(SourceFile:79)
	at bfk.a(SourceFile:1039)
	at ave.av(SourceFile:915)
	at ave.a(SourceFile:325)
	at net.minecraft.client.main.Main.main(SourceFile:124)