Minecraft Crashed (Crash Reported Anexed)

I was playing minecraft (with my new good pc) and i started to lag alot (like block lag and such...) then i tried to log out from the game to the menu and the game just crashed. In Attachment is the crash report.

Description: Updating screen events

java.lang.NullPointerException: Updating screen events
	at bww.a(SourceFile:57)
	at bxd.a(SourceFile:342)
	at bxd.k(SourceFile:405)
	at bxd.p(SourceFile:382)
	at bss.r(SourceFile:1473)
	at bss.as(SourceFile:877)
	at bss.a(SourceFile:314)
	at net.minecraft.client.main.Main.main(SourceFile:120)