     
     if let cell = tableView.cellForRow(at: indexPath) {
       let checklist10Item = checklist10?.checklist10Items[indexPath.row]
-      checklist10Item.toggleChecked()
-      configureCheckmark(for: cell, with: checklist10Item)
+      checklist10Item?.toggleChecked()
+      configureCheckmark(for: cell, with: checklist10Item!)
     }
     
     tableView.deselectRow(at: indexPath, animated: true)


    let checklist10Item = checklist10?.checklist10Items[indexPath.row]
    let label = cell.viewWithTag(1000) as! UILabel
    label.text = checklist10Item.text
    
    configureCheckmark(for: cell, with: checklist10Item)
    
    return cell
  }

  
  // MARK: TV Data Source related
  override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return (checklist10?.checklist10Items.count)!
  }
  
  override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
