A python function is executing multiple times and ignoring an "if" statement

I'm trying to execute the following code:

class PlayerControl:
    def __init__(self):
        self.player_menu = views.PlayerMenu()
        self.player_model = models.Player()

    def main():
        choice = views.PlayerMenu.main()
        if choice == "1":
            if type(models.Player.list_not_participants()) == None:
                print("Aucun joueur disponible.")
                PlayerControl.create_players()
            else:
                PlayerControl.select_players()
        elif choice == "2":
            PlayerControl.create_player()
        elif choice == "q":
            sys.exit()
        else:
            PlayerControl.main()

And I'm getting the following output if I type "1" and the type is indeed None:

Aucun joueur disponible.

Aucun joueur disponible.

Traceback (most recent call last):

[...] TypeError: 'NoneType' object is not iterable

It looks like the code is executing twice while respecting the "if" condition and a third time without doing so. I've looked into the other answers available on StackOverflow, but it's not a problem of mutual import...

It's probably a very silly mistake because I'm a beginner, but I'm really stuck on that one. Thank you in advance for your help!