How to prevent present modally an active controller?

Question

We have 2 controllers: MainVC and ProfileVC. From MainVC we go to ProfileVC with profileButton press (left item on navigation bar).

In Profile VC we hav

Answer 1

To prevent this exception. Simply just dismiss the currently showed ViewController to go back to the caller of the ViewController that you are dismissing:

self.dismiss(animated: true, completion: nil)