[MC-63973] Multiplayer: giving yourself a Player-Skull crashes the Game

When you give yourself a player skull on a server, the game crashes and shows up the attached crash report.

(Don't wonder about the Date/Time of the crash report...)

Description: Rendering entity in world

java.lang.NullPointerException: Rendering entity in world
	at bci.b(SourceFile:96)
	at chp.a(SourceFile:42)
	at cop.a(SourceFile:98)
	at com.a(SourceFile:119)
	at com.a(SourceFile:17)
	at coa.a(SourceFile:288)
	at coa.a(SourceFile:253)
	at coa.a(SourceFile:220)
	at ciy.a(SourceFile:586)
	at cht.a(SourceFile:1211)
	at cht.a(SourceFile:1117)
	at cht.b(SourceFile:970)
	at brp.ar(SourceFile:896)
	at brp.a(SourceFile:311)
	at net.minecraft.client.main.Main.main(SourceFile:120)