Be-Theme: Muffin builder ISSUES: Update, publish and preview of pages not able - php errors

Hello, 


we have a problem with the b-theme. 
this is the url: https://www.fmg-ag.de/

When ever you want to publish or update a page / post, or even preview a page ,we get a ton of php erros. 

One Example: 

Fatal error: Uncaught Error: [] operator not supported for strings in /homepages/39/d152670468/htdocs/Homepage/wp-content/themes/betheme/betheme/functions/builder/back.php:909 Stack trace: #0 /homepages/39/d152670468/htdocs/Homepage/wp-content/themes/betheme/betheme/functions/meta-portfolio.php(429): mfn_builder_save(534) #1 /homepages/39/d152670468/htdocs/Homepage/wp-includes/plugin.php(524): mfn_portfolio_save_data(534) #2 /homepages/39/d152670468/htdocs/Homepage/wp-includes/post.php(3409): do_action('save_post', 534, Object(WP_Post), false) #3 /homepages/39/d152670468/htdocs/Homepage/wp-includes/revision.php(300): wp_insert_post(Array) #4 /homepages/39/d152670468/htdocs/Homepage/wp-admin/includes/post.php(1724): _wp_put_post_revision(Array, true) #5 /homepages/39/d152670468/htdocs/Homepage/wp-admin/includes/post.php(1758): wp_create_post_autosave(Array) #6 /homepages/39/d152670468/htdocs/Homepage/wp-admin/post.php(278): post_preview() #7 {main} thrown in /homepages/39/d152670468/htdocs/Homepage/wp-content/themes/betheme/betheme/functions/builder/back.php on line 909

This happened when I clicked „edit page“ and then „preview page“.


We tried to update the Be-Theme. 
We did it by Envato market Plugin and the API. 
After that the complete website crashed and we uses a backup to restore. 

Can you help us with this issue please. 

Thank oyu very much ! 

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