[MC-125451] Crash when logging into multiplayer without logging into singleplayer first

Workaround

Start Minecraft and start playing a Singleplayer game.
Disconnect to return to main menu
Join Multiplayer game

18w08b: crash-2018-02-22_18.07.29-client.txt

Description: Tesselating block in world

java.lang.NullPointerException: Tesselating block in world
	at vo$a.a(SourceFile:77)
	at vo$a.a(SourceFile:63)
	at aye.a(SourceFile:210)
	at bgg.a(SourceFile:263)
	at clz.a(SourceFile:85)
	at cly.a(SourceFile:65)
	at coc.b(SourceFile:180)
	at cny.a(SourceFile:100)
	at cnx.b(SourceFile:141)
	at clk.a(SourceFile:923)
	at cle.b(SourceFile:1161)
	at cle.a(SourceFile:1096)
	at cle.a(SourceFile:957)
	at bya.b(SourceFile:820)
	at bya.a(SourceFile:381)
	at net.minecraft.client.main.Main.main(SourceFile:141)