ios application crashes when deleting line in uitableView

I have a problem in my UITableView which filled with data: [(gamme: String, [(product: String, quantity: Double)])], everything works fine: inserting rows and sections, deleting row and section, reloading. But sometimes and when I try to delete lots of lines in fast way (line by line by swiping the line the table and tap (-) ). it leads to a crash like in the screenshot:

and this is my func that delete lines:

    override func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {

    let delete = UITableViewRowAction(style: .destructive, title: "-") { (action, indexPath) in

        let cmd = self.groupedData[indexPath.section].1.remove(at: indexPath.row)
        tableView.deleteRows(at: [indexPath], with: .right)
        self.delegate?.didDeleteCmdLine(cmd)

        if self.groupedData[indexPath.section].1.count == 0 {
            self.groupedData.remove(at: indexPath.section)
            tableView.deleteSections(IndexSet(integer: indexPath.section), with: UITableViewRowAnimation.right)
        }
    }

    return [delete]
}

why is that happening ?

from ios application crashes when deleting line in uitableView