You can chrck your console log. And if you found the error paste that error in google it will tell you how you can fix it or just share your log here using pastebin.
Well, I already know why it's crashing. It's due to corrupt playerdata, thus I downloaded the world and fixed the player data. However, since the world is bigger than the allowed upload size I can't upload the fixed data... So I'm kind of stuck in a corner here! D: