[MC-36388] NPE when attempting to connect to MC realms world

When attempting to connect to a Minecraft Realms world, the game crashed with a NullPointerException.

Description: Ticking screen
java.lang.NullPointerException: Ticking screen
	at em.a(SourceFile:135)
	at bfc.a(SourceFile:132)
	at bev.c(SourceFile:47)
	at azb.o(SourceFile:1317)
	at azb.ad(SourceFile:755)
	at azb.e(SourceFile:706)
	at net.minecraft.client.main.Main.main(SourceFile:103)