Hello, there is no field NOTE in table ORDERS in early prestashop 1.7 versions. The NOTE field have appeared in later prestashop 1.7 versions. Then, you can try this code:
if (!empty($message) && Validate::isCleanHtml($message)) { // Retrieve the last created order for the current cart $order = Order::getByCartId((int)$id_cart); if ($order) { // Sanitize the message $cleanMessage = strip_tags($message, '<br>'); // Update the note field in the orders table Db::getInstance()->update( 'orders', ['note' => pSQL($cleanMessage)], 'id_order = ' . (int)$order->id ); } }