Updating WP to 5.4.1–nb_NO - theme error

Hi
When updating WP, the site got blank and I received the error: 

PHP Fatal error: 
Uncaught Error: Call to undefined function mfn_user_os() in
/home/2/t/tibidrikk/www/wp-content/themes/betheme/header.php:15

Site url: https://tibidrikk.no/

Any help appreciated, thank you! 

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