loadHTMLString和“thread 1 exc_bad_access（code = exc_i386_gpflt）”

Question

嗯，我不确定这是一个真正的问题，但看到错误是不愉快的。出现“thread 1 exc_bad_access（code = exc_i386_gpflt）”错误，模拟器中出现概率约为50％。但实际设备中没有错误。 我尝试使用选项，但没有明显的结果。 我只有WKWebView和一个Button。代码是：

import UIKit
import WebKit

class ViewController: UIViewController {

    @IBOutlet weak var WebView: WKWebView!

    let all = ["kjhgjhkg","qqqqqqqqq", "wwwwwwwww", "lllllllll", "bbbbbbbb"]
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib. 
 WebView.loadHTMLString("<h1>The first title</h1>", baseURL: nil)   
    }
 override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    @IBAction func btnRefresh(_ sender: UIButton) {
        let RandomNomber = Int(arc4random_uniform(UInt32(all.count)))
//    let myString = all[RandomNomber]
//     let myString2 = "<h1>" + myString + "</h1>"
            WebView.loadHTMLString("<h1>" + all[RandomNomber] + "</h1>", baseURL: nil) 
    }
}