Swift - Fatal Error on Performing Segue

Question

My iOS app is crashing when I run the following line of code after the push of a standard UIButton:

self.performSegueWithIdentifier("loginAttempt", sender: self)

The segue identifier name is correct as I copied and pasted the name from the sidebar into the code. Upon remove the code the app stops crashing when the button is pressed.

The error I get is:

Thread 1: EXC_BREAKPOINT (code=1, subcode=0x1002544fc)

And in the Output box:

fatal error: unexpectedly found nil while unwrapping an Optional value

Answer 1

error is somewhere else but for clearity.

1)put breakpoint on seguing line and note is control is reaching to segue line.

Or

2) following put your segue for testing:

override func viewDidAppear(animated: Bool) {
   self.performSegueWithIdentifier("loginAttempt", sender: self)
}

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
   if (segue.identifier == "loginAttempt") {
        print("Hi segue is working")
   }
}

if it prints line then segue is working .