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In the newer version of prestashop i encountered a weird bug when you add the cart tot the back-end. the debug mode screenshot is below. and the code is below the screenshot. require 'config/config.inc.php'; require 'init.php'; session_start(); try { $id = isset($_SESSION['Cart_ID']) ? (int)$_SESSION['Cart_ID'] : null; $cart = new Cart($id, null); $cart->save(); // problem is just in this line $_SESSION['Cart_ID'] = $cart->id; if($_SERVER['REQUEST_METHOD'] === "POST") { if(isset($_POST['add_to_cart'], $_POST['id_product']) || !empty($_POST['id_product'])) { $cart->updateQty(1, $_POST['id_product']); $cart->update(); header("Location: index.php"); } } } catch (PrestaShopException $e) { echo $e; }