Minecraft Autocrash issue

Whenever signing into minecraft, the game launches up normally then slaps a crash report onto the screen. No details why just:
GAME CRASH

An unexpected issue occurred and the game has crashed. We're sorry for the inconvenience.

Can someone explain to me why this is happening, and if so, How can I fix this
(Note: This didn't happen the day before. Nobody else has my password. Nobody else knows my account.)

The Debug reads:
[0211/132649.206:ERROR:settings.cc(261)] Settings magic is not 1129342067