uiviewcontroller - Swift - Make segue from SKScene to Viewcontroller (game crash after getting out and then in to game) -

ok.. have problem, , cant figure out doing wrong, hope can med! have made game, , works should, can play, quit , restart. when score enough points, viewcontroller here @ medal. problem comes, when user goes game again after picking medal. game wont show game-scene.

i use notificationcenter in gameviewcontroller, make segue gamescene. , try in ways remove scene viewcontroller, because think problem lies there. nothing seems work :(

in gameviewcontroller have:

 notificationcenter.default.addobserver(self, selector: #selector(gameviewcontroller.doasegue), name: nsnotification.name(rawvalue: "doasegue"), object: nil)     func doasegue(){         let skview = self.view as! skview         skview.presentscene(nil)         self.dismiss(animated: false, completion: nil)         print(self.view)         self.performsegue(withidentifier: "gametooffer", sender: self)     } 

and when player dies use code in skscene, before make segue:

 if won {               self.removeallactions()             self.removeallchildren()             won = false             makesegue()         }  func makesegue() { notificationcenter.default.post(name: nsnotification.name(rawvalue: "doasegue"), object: nil) } 

i have no idea doing wrong. said, games restarts fine, dont think have forgot reset anything. reason cant in, once getting out of game. hope can me!