title: Cant update theme pages using Page Builder
body: <p>We are currently migrating our site from php 5.6 to 7.2 as our hosts have set a fixed end of life for this.</p>
  
  <p>We are using BeTheme and we can see that most features are intact, however when updating posts the site breaks when the muffin builder existing layouts, this largely is due to a </p>
  
  <p>Fatal error: Uncaught Error: [] operator not supported for strings in /XXXXX/wp-content/themes/XXXXX/functions/meta-functions.php</p>
  
  <p><code>$mfn_items[$newParentSectionID]['items'][] = $item;</code></p>
  
  <p>Any ideas to prevent this?</p>