danielstoelzner

This code in your functions.php fixes this behavior:

add_action('init', function() {
    if (isset($_GET['add-to-cart'])) {
        $value = $_GET['add-to-cart'];
        if (strpos($value, 'gla_') === 0) {
            $product_id = (int) substr($value, 4);
            $product = wc_get_product($product_id);
            if ($product && $product->exists()) {
                WC()->cart->add_to_cart($product_id);
            } else {
                wc_add_notice('Invalid product ID provided.', 'error');
            }
        }
    }
});