Ios UIview中的两个表视图出现致命错误

在我的应用程序中，我想在UIViewController中显示两个表视图，但我有一个致命错误：致命错误：在展开可选值时意外发现nil

有人能帮我吗

以下是uiview的完整代码

类MyPropertiesViewController:UIViewController、UITableViewDelegate、UITableViewDataSource{

//细胞识别器 让stdcellIdentifier=“stdcell”

}

---

谢谢

检查您的单元格类是否真的是GuaranteeCell（可能存在错误）

尝试将为tableViewcell注册而编写的viewDidLoad代码移动到ViewWillDisplay方法，并尝试将这两个表视图正确连接到您的故事板中？我已经检查过，两个tableview的单元格都是GuaranteeCell

//table view extended
@IBOutlet weak var extandedTableViex: UITableView!

// table view standart
@IBOutlet weak var standartTableView: UITableView!
//list of data
let stdlist = ["1","2","3", "4","5","6","7","8","9"]

let Extlist = ["E1","E2" ]

let extcellIdentifier = "extcell"

override func viewDidLoad() {
    super.viewDidLoad()
    standartTableView.delegate = self
    standartTableView.dataSource = self

    standartTableView.delegate = self
    standartTableView.dataSource = self

    standartTableView.scrollEnabled = false
    extandedTableViex.scrollEnabled = false

    self.standartTableView.registerClass(GuaranteeCell.self, forCellReuseIdentifier: stdcellIdentifier)
    self.extandedTableViex.registerClass(GuaranteeCell.self, forCellReuseIdentifier: extcellIdentifier)
}

//count cell
  func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    if tableView == standartTableView {
        return self.stdlist.count;
    } else {
        return self.Extlist.count;
    }

}

// add cell
   func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

    if tableView == standartTableView {
        let cell:GuaranteeCell = self.standartTableView.dequeueReusableCellWithIdentifier(stdcellIdentifier) as! GuaranteeCell
        print("list-element " + self.stdlist[indexPath.row])
           print(indexPath.row)

        cell.guaranteeLabel.text = self.stdlist[indexPath.row]
        return cell
    } else {
        let cell2:GuaranteeCell = self.extandedTableViex.dequeueReusableCellWithIdentifier(extcellIdentifier) as! GuaranteeCell
        cell2.guaranteeLabel.text = String(self.Extlist[indexPath.row])
        return cell2  
    }
}

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) { }

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}