Player not falling down unreal engine

I have a path spline where i set various meshes. My player run on it using same blueprint. The problem is that my player not fall down when there is no path below the player , it’s keep running further. I want to make player fall when there is no base or gap .

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What is player (pawn with a movement component?) and how are you moving it?

The player is pawn actor. track_ref variable contain the value of Track_bp.

You’re setting the mesh location every frame, how is it supposed to fall if you’re forcing it to stay in place…

If i remove the pin from event tick then it fall down on starting it is not running on the platform or spline.

if i remove the pin from event tick then it keep running forward and even then it is not fall down. I want that when there is gap on the base(floor) and the player not jump there then it fall down.