My car pops out of the world

I began to make a small racing game today, just to learn how to use ingame animations etc better. My problem though, is that when I play the game, the car pops out of the world. I’m attaching the file here, and hopefully some of you would look at it, and tell me what’s wrong.

Thank you.

Well, I fixed it. Only needed to re-parent the armature and the car.