Why this happens

Page builders like Elementor or Divi rely heavily on JavaScript to render their visual editor, so this is usually a front-end conflict rather than a PHP fatal error - commonly caused by browser caching an old version of the builder's scripts, a caching plugin serving stale files, or another plugin's JavaScript colliding with the builder's own scripts.

Step-by-step fix

  1. Clear your browser cache and cookies.
  2. If a caching plugin (WP Rocket, W3 Total Cache) is installed, clear its cache.
  3. Update the page builder plugin to the latest version.
  4. Press F12 to open the browser console - if a JavaScript error appears, share a screenshot with a developer.

How to prevent it happening again