Wall Jump Bug in Simple Platformer Game

I just got mmf2 and have been looking at some tutorials to help me learn how the make a platforming game. Ive managed so far to set it up using fast loops etc and have added a double jump using flags but i have a problem where if you fall down a gap next to a wall and you press the jump button repeatedly you can basically wall jump up the wall and escape death from the pit. this is because my multimedia fusion program is set up so that when the players collision box is overlapping a backdrop it allows it to jump no matter what side of the box is touching the backdrop platforms. Is there anyway that i can make it so that if only the side of the players collision box is overlapping a backdrop then the player cant jump and wont be able to escape?

also please be very descriptive as i am still new to the program :D