Unable to save changes

Hi,

I am unable to save changes in pages built by the builder. I have increased php_value max_input_vars 10000 but that didn't help. I enabled debug logging and this is what I get when i save changes to a page,


  1. Request URL:
  2. Request Method:
    POST
  3. Status Code:
    200 OK

Fatal error: Uncaught Error: [] operator not supported for strings in /www/webvol1/wp/mz8hciffjddmmn0/mvgruppen.se/public_html/wp-content/themes/betheme/functions/builder/back.php:918 Stack trace: #0 /www/webvol1/wp/mz8hciffjddmmn0/mvgruppen.se/public_html/wp-content/themes/betheme/functions/meta-portfolio.php(460): mfn_builder_save(23) #1 /www/webvol1/wp/mz8hciffjddmmn0/mvgruppen.se/public_html/wp-includes/class-wp-hook.php(289): mfn_portfolio_save_data(23) #2 /www/webvol1/wp/mz8hciffjddmmn0/mvgruppen.se/public_html/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array) #3 /www/webvol1/wp/mz8hciffjddmmn0/mvgruppen.se/public_html/wp-includes/plugin.php(478): WP_Hook->do_action(Array) #4 /www/webvol1/wp/mz8hciffjddmmn0/mvgruppen.se/public_html/wp-includes/post.php(4144): do_action('save_post', 23, Object(WP_Post), true) #5 /www/webvol1/wp/mz8hciffjddmmn0/mvgruppen.se/public_html/wp-includes/post.php(4235): wp_insert_post(Array, false) #6 /www/webvol1/wp/mz8hciffjddmmn0/mvgruppen.se/public_html/wp-admin/inc in /www/webvol1/wp/mz8hciffjddmmn0/mvgruppen.se/public_html/wp-content/themes/betheme/functions/builder/back.php on line 918

Greatful for any tips of suggestions on how to solve this.

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