Falling through the wall

How come when I press a lot of keys at onces when running into a wall I go right through it?

http://www.savefile.com/files/1104111

I couldn’t get it to clip. When I pressed a lot of keys my computer beeped :slight_smile:
I really can’t foresee this being that big of a problem. (there have been comercial games that the character would randomly fall through the floor, with no patches to fix it, ever)