Character Stop on Collision

I am working on a project that deals with using the nav mesh, and a click method for player movement. We need our character to stop on impact of any collision he bumps into, so the player is not able to just click on the target of the level, and the nav mesh let them navigate without knowing the level. Can anyone help me and our programmer with logic that would help this?

You could work with triggerboxes attachd to the objects the player can collide with. every time the pawn overlaps the triggerbox, movement will stop.