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Fatal error on update BeTheme

I have version 21.7.4 and when I update to version WordPress stops working showing the error "There has been a critical error on your website."
Activating debug mode I see the following error:

Fatal error: Uncaught Error: Call to undefined function mfn_is_elementor() in /home/desatas1/public_html/wp-content/themes/betheme/functions/theme-head.php:1325 Stack trace: #0 /home/desatas1/public_html/wp-includes/class-wp-hook.php(289): mfn_body_classes(Array) #1 /home/desatas1/public_html/wp-includes/plugin.php(206): WP_Hook->apply_filters(Array, Array) #2 /home/desatas1/public_html/wp-includes/post-template.php(834): apply_filters('body_class', Array, Array) #3 /home/desatas1/public_html/wp-includes/post-template.php(593): get_body_class(Array) #4 /home/desatas1/public_html/wp-content/themes/betheme/header.php(25): body_class() #5 /home/desatas1/public_html/wp-includes/template.php(723): require_once('/home/desatas1/...') #6 /home/desatas1/public_html/wp-includes/template.php(672): load_template('/home/desatas1/...', true) #7 /home/desatas1/public_html/wp-includes/general-template.php(41): locate_template(Array, true) #8 /home/desatas1/public_html/wp-content/themes/betheme/page.php(10): get_header() #9 /home/desatas1 in /home/desatas1/public_html/wp-content/themes/betheme/functions/theme-head.php on line 1325



  • I forgot to comment that I work with a child theme of which I have not touched any of the files that shows in the fatal error.
    Likewise, I came to activate the non-child theme and the same thing happens.
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