I expected the world to open, but the game crashed instead.

Put the summary of the bug you're having here

I was playing in a creative world where I on superflat was edited so that there were 90 layers of pig spawners, then there was an extreme lag so I logged out and then logged back in. Next, I played a world that was the same as a waterworld except for as the top 2 layers being water and sand they were TNT and dirt. Then I accidently blew up the TNT and went back to title screen. Then when I tried to open a regular creative world Minecraft crashed.

Please see the attached crash report.

I can't play Minecraft at all now.