Application crashing without information about crash when transitioning to another view controller - swift

Question

I have two view controllers, LoginViewController and TermsAndPrivacyViewController.
On first view controller, there is a button that has IBAction, which opens TermsAndPrivacyViewController. On TermsAndPrivacyViewController I have web view, that loads url I am passing from LoginViewController. So, this is the code(Login view controller):
#IBAction func tosAction(_ sender: Any) {
if let vc = UIStoryboard(name: "Login", bundle: nil).instantiateViewController(withIdentifier: kTOSViewControllerIdentifier) as? TermsAndPrivacyViewController{
vc.url = URL(string: kTOSUrl)
self.navigationController?.pushViewController(vc, animated: true)
}
}
On TermsAndPrivacyViewController, I have this:
override func viewDidLoad() {
super.viewDidLoad()
webView.navigationDelegate = self
if let `url` = url {
webView.load(URLRequest(url: url))
webView.allowsBackForwardNavigationGestures = true
}
}
So, when I hit a button, app crashes SIGABRT message, and nothing else. Also, I don't get any crash report on Firebase Crashlytics (I have detached an app from a debugger first, and produced a crash).
Now, the strange part :/ ... If I put a breakpoint on a first line of tosAction() method, and go step by step (or just let it continue), everything works normally. No crash???
Am I missing something obvious here? What is the reason of crashing? Also, I tried to put Exception Breakpoint but nothing changes. I only get this:
and a console:
so, kinda no information about crash at all.
EDIT
Ok, now the even more strange part :) I just tried app on different phones.
App crashes on iPhone 6s+, iOS 12.1(16B5059d), but it works normally on iPhone 6, iOS 12.0 (16A366)

Answer 1

maybe you use library or framework that not supported by those device.
you must see the error
did you try this?
when the app crashing, in the console press cmd+F and search exception.
now you can see your error
hope to helpful.

Answer 2

Maybe you can use segue methods inside your LoginViewController.
#IBAction func tosAction(_ sender: Any) {
performSegue(withIdentifier: "GoToWeb", sender: nil)
}
}
And call prepareForSegue
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if (segue.identifier == "GoToWeb") {
let vc = segue.destination as! TermsAndPrivacyViewController
vc.url = "YOUR_URL"
}
And the code inside TermsAndPrivacyViewController don't change
Edit:
Maybe your not binding well your UIButton, can you verify in the right panel, in the section "Show the connection inspector" if your button is call only once.

Answer 3

To get further information on this type of crashes, open the Breakpoints menu (or press CMD+8), click the plus icon in the bottom left corner and press Exception Breakpoint.... Right click, then edit. Add an action of the type Debugger Command and enter the following:
Reproduce the crash again, this time the console will output a more useful error message.