如何解决“线程1：致命错误：在隐式展开一个可选值时意外发现nil”

Question

尝试构建应用后，包含cell?.img.image = UIImage (named: name[indexPath.row])的行显示一条错误消息。它指出：

  

线程1：致命错误：在隐式展开一个可选值时意外发现nil

我正在使用当前版本的xcode

import UIKit

class ViewController: UIViewController {
    var name = ["Avenger", "Apple of My Eye", "Now You See Me", "The Prestige", "Stardust", "The Illusionist"]

    @IBOutlet weak var tableView: UITableView!
}

extension ViewController: UITableViewDelegate, UITableViewDataSource {
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return name.count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as? CellTableViewCell
        cell?.lbl.text = name[indexPath.row]
        cell?.img.image = UIImage (named: name[indexPath.row])
        return cell!

CellTableViewCell.swift

import UIKit

class CellTableViewCell: UITableViewCell {

    @IBOutlet weak var lbl: UILabel!
    @IBOutlet weak var img: UIImageView!




    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }

    override func setSelected(_ selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)

        // Configure the view for the selected state
    }

}