How do I fix the breakpoint on clicking the button in Fun Facts iOS app?

The app compiles fine, but on clicking the button to retrieve the new string, it hits a Thread 1: Breakpoint 1:1. This was the state output

self FunFacts.ViewController 0x7b7467c0 0x7b7467c0 UIKit.UIViewController UIViewController
UIKit.UIResponder UIResponder
ObjectiveC.NSObject NSObject
funFactLabel UILabel! "1 value" Some [0] UILabel * 0x7b7a7800 0x7b7a7800 [0] UILabel

(lldb)

My code looks like this.

class ViewController: UIViewController {

    @IBOutlet weak var funFactLabel: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    @IBAction func showFunFact() {
        funFactLabel.text = "Another Interesting Fact"
    }


}

I'm not sure if its relevant, but when I started coding this the original @IBOutlet code was this:

@IBOutlet var funFactLabel: [UILabel]!

However, this code would not allow me to use .text and would not run with .description.

Help... I've hit a wall.

Thanks, Pete