fatal error: unexpectedly found nil while unwrapping an Optional value

Do you have segueLabelText set to an empty string

import UIKit

class PlaylistDetailViewController: UIViewController {

    @IBOutlet weak var buttonPressLabel: UILabel!
    var segueLabelText: String = ""
    //rest of code .................    
}

Hello Sean,

here i got the same problem, but taking a look for a while I just found that for some reason my buttonPressedLabel just lost the reference to the outlet.

If you go to your Main.storyboard and click the label in the Artist Scene and click on the Show Connectors inspector, you are going to notice that there is no reference to your label.

As you can see I just made a test code like this: added a new reference to the label, and tried it again

'''swift

@IBOutlet weak var buttonPressLabel: UILabel!
var segueLabelText: String = ""

@IBOutlet weak var test: UILabel!

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.

   // buttonPressLabel.text = segueLabelText
    test.text = segueLabelText  
}

'''

It works for me, now i just need to delete the old reference and the text one and add it again . Hope this helps

I had the same problem and fixed it my creating a new outlet for the label.