How to check if the path does not exist, or doesn't reach the target

I just started using A* and took a few video tutorals and have a general/mild understanding on how it works. Though there is one thing I am having trouble with and that’s how to check if a path simply does not exsist. Im assuming this is something that I can edit in the Seeker script but i dont want to edit anything when I truly dont know what I am doing.

You may be interested in the PathUtilities.IsPathPossible method: PathUtilities - A* Pathfinding Project