Hi,
I emptied the function.php file and it didn’t change anything.
In the meanwhile I’ve checked my other templates I’ve have added code to.
In the footer.php I found a slight change where you add a hook.
<?php
/**
* generate_after_footer hook.
*
* @since 2.1
*/
do_action( 'generate_after_footer' );
wp_footer();
?>
This is new once I added it. everything worked fine again.