Critical error – method on boolean value instead of object

This solved the issue for me (with a little ChatGPT help):

The line causing the problem is:

if ( $order->get_meta( '_pre_order_date' ) ) {

To resolve the error message "Uncaught Error: Call to a member function get_meta() on bool", ensure that $order is a valid object before calling the get_meta() method.

In the checkWholeOrders() function, $order is obtained via wc_get_order(), but it seems there may be a problem getting the order information.

To address this issue, you can make the following changes:

public function checkWholeOrders( $order_id ) {

$order = wc_get_order( $order_id );

if ( $order ) { // Check if $order is a valid object

if ( $order->get_meta( '_preorder_date' ) ) {

$order->set_status( 'wc-pre-ordered' );

$order->save();

}

}

}

By adding the if ($order) condition, you check that $order is a valid object before calling the get_meta() method. This prevents the error message if $order is not initialized correctly. This change actually solved the problem.

And you can use a hook in the theme's functions.php file or in a custom plugin to make the changes you want without having to rely on updates to the Pre-Orders for WooCommerce plugin. You can use the woocommerce_checkout_update_order_meta hook for this, which runs when the order metadata is updated during the checkout process. Here's how you can do it:

// Voeg de functie toe die de orderstatus controleert en bijwerkt
function custom_check_whole_orders( $order_id, $data ) {
    $order = wc_get_order( $order_id );
    if ( $order ) { // Controleer of $order een geldig object is
        if ( isset( $data['preorder_date'] ) ) {
            $order->update_meta_data( '_preorder_date', esc_attr( $data['preorder_date'] ) );
        } else {
            global $woocommerce;
            $cart = $woocommerce->cart->get_cart();
            $checkout = new Woocommerce_Preorders\Checkout(); // Instantieer de Checkout-klasse om toegang te krijgen tot de benodigde methoden
            $checkout->checkPreOrderProducts( $cart ); // Roep de checkPreOrderProducts-methode aan om pre-orderproducten te controleren
            if ( count( $checkout->getPreOrderProducts() ) > 0 ) {
                $oldestDate = str_replace( [' 00:00:00'], [''], $checkout->getOldestDate() );
                $order->update_meta_data( '_preorder_date', esc_attr( $oldestDate ) );
            }
        }
        $order->save();
    }
}

// Voeg de hook toe om de functie aan te roepen
add_action( 'woocommerce_checkout_update_order_meta', 'custom_check_whole_orders', 10, 2 );

This code will run the custom_check_whole_orders function every time the order metadata is updated during the checkout process. It will provide the same functionality as the original checkWholeOrders function, but now it is called via a hook outside the plugin, so it is not dependent on plugin updates.

Hello,
I hope you are well

Thanks for sharing your feedback,
Checking the log you have provided, I can see that the error arose here:

“Uncaught Error: Call to a member function get_meta() on bool in /home/website199/domains/ourwebsite.com/public_html/wp-content/plugins/pre-orders-for-woocommerce/src/Checkout.php:67“

public function setPreroderStatus( $status, $order_id, $order ) {
	$order = wc_get_order( $order_id );

	if ( $order->get_meta( '_preorder_date' ) ) {
		return 'pre-ordered';
	}
	
	return $status;
}

So the error occurred because?wc_get_order()?returned a boolean value., most likely did not find the $order_id

Therefore, it is good to add a similar conditional statement as you mentioned, to avoid these errors, something like this:

.....

//Conditional statement
if ( ! $order ) {
	return $status;
}

.....

We will improve it for the next version, thx !

– Best Regards

That is great, thanks for getting back, looking forward to the update. All the best for now and thanks again.