PHP 8 Issue / Mobile Version

Hi,

I tried to increase the PHP version of 2 different websites to 8.0. In both cases the desktop version is ok, but in the mobile versio one only receives an error page with the following messages

Fatal error
: Uncaught Error: Call to undefined function create_function() in /homepages/29/d113802304/htdocs/wp/wp-content/themes/inovado/framework/inc/widgets/custommenu.php:67
Stack trace:
#0 /homepages/29/d113802304/htdocs/wp/wp-content/themes/inovado/functions.php(43): include_once()
#1 /homepages/29/d113802304/htdocs/wp/wp-settings.php(566): include(‘/homepages/29/d…’)
#2 /homepages/29/d113802304/htdocs/wp/wp-config.php(121): require_once(‘/homepages/29/d…’)
#3 /homepages/29/d113802304/htdocs/wp/wp-load.php(50): require_once(‘/homepages/29/d…’)
#4 /homepages/29/d113802304/htdocs/wp/wp-blog-header.php(13): require_once(‘/homepages/29/d…’)
#5 /homepages/29/d113802304/htdocs/wp/index.php(17): require(‘/homepages/29/d…’)
#6 {main}
thrown in

What can be done to fix this?

Kind regards

Luisa

Ticket