Shahab ud Din Mirza

I was also able to fix this by adding below code to functions.php under child theme:

function enqueue_qrcode_script() {
// Enqueue the external jQuery QR Code script
wp_enqueue_script(‘jquery-qrcode’, ‘https://cdnjs.cloudflare.com/ajax/libs/jquery.qrcode/1.0/jquery.qrcode.min.js’, array(‘jquery’), null, true);
}

add_action(‘wp_enqueue_scripts’, ‘enqueue_qrcode_script’);