How do I fix my solids??

I am making a game where you are a sprite with a 3d camera. So you are in first person. The problem is, when I put a solid behavior on the 3d wall, as soon as the sprite collides with it the screen goes blank and it is unescapable. You have to reset the game. I want you to simply not be able to go through walls.

I suggest you get your idea to work in 2d first, so you can see what is going on from a top down view.