Ya all you need to do is:
Double Click on your layout and create a Sprite. Name it whatever you like and make it any color. Choose Invisible in the Properties Menu (Default left side panel) -> Initial Visibility -> Invisible
In your Event:
Every Tick | "Your newly created, invisible sprite" | Set position to another object --> "Your Character Sprite"
Every Tick | "Your Character Sprite" ( Or whatever has the pathfinding behavior attached to it) | Regenerate Pathfinding Obstacle Map around --> "Your newly created, invisible sprite"
Thats it!
Hopefully that helps.