unexpectedly found nil while unwrapping an optional value while tagging particular button in headerview

Question

im sending an array of response from one view to another view but by tagging value of tapped header giving pressed function as shown below

func pressed(_ sender: UIButton) {

        let ViewAllVC : ViewAllViewController = self.storyboard?.instantiateViewController(withIdentifier: "VIEWALLID") as! ViewAllViewController

        ViewAllVC.navigationStringName = "View All"


        ViewAllVC.viewAllArray = productDetailsArray[sender.tag] as! NSArray

        self.sideMenuViewController?.contentViewController = UINavigationController(rootViewController: ViewAllVC)

    }

and in destination view I am setting image for the image view in the cell as follows

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
    {
        let cell = tableView.dequeueReusableCell(withIdentifier: "reuseIdentifier", for: indexPath) as! ViewAllCell
         if navigationStringName == "View All"
         {

        let URLBaseString = "http://vehiclebuzzzz.com/"

        let url = URL(string:URLBaseString .appending((viewAllArray[i] as AnyObject).value(forKey: "img_name") as? String)


                let dataurl = try? Data(contentsOf: url!)

                cell.productImageView?.image = UIImage(data: dataurl!)



                }
return cell
}

and it is showing for particular category is selected not for all