Send cancelled and failed order email to customer

Question

I need to send cancelled and failed order email to customers in Woocommerce 3.4+. I'm constantly getting Fatal error: Uncaught Error: Call to a member function get_billing_email() on null in I've tried few function (like below) from stackoverflow with same result:

function wc_cancelled_order_add_customer_email( $recipient, $order )
{
 return $recipient .= "," . $order->get_billing_email();
}
add_filter( 'woocommerce_email_recipient_cancelled_order', 'wc_cancelled_order_add_customer_email', 10, 2 );
add_filter( 'woocommerce_email_recipient_failed_order', 'wc_cancelled_order_add_customer_email', 10, 2 );

What is wrong? How can I avoid this error?

Answer 1

You should need check that $order argument is valid instance of the WC_Order Class:

add_filter( 'woocommerce_email_recipient_cancelled_order', 'wc_cancelled_order_add_customer_email', 10, 2 );
add_filter( 'woocommerce_email_recipient_failed_order', 'wc_cancelled_order_add_customer_email', 10, 2 );
function wc_cancelled_order_add_customer_email( $recipient, $order ){
    // Avoiding errors in backend (mandatory when using $order argument)
    if ( ! is_a( $order, 'WC_Order' ) ) return $recipient;

    return $recipient .= "," . $order->get_billing_email();
}

Code goes in function.php file of your active child theme (or active theme). Tested and works.

You could also use instead in this particular case:

// Avoiding errors in backend (mandatory when using $order argument)
if ( ! method_exists( $order, 'get_billing_email' ) ) return $recipient;

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Related and similar:

• Sending email to customer on cancelled order in Woocommerce
• Add recipients based on user role to failed and cancelled WooCommerce emails