WordPress admin critical error after installing a page builder premium plugin

Description

A WordPress site may show a critical error in the admin area immediately after installing or enabling a premium page builder add-on. The issue may be caused by a compatibility mismatch between the core plugin and its premium extension, which triggered a PHP fatal error and prevented normal access to the WordPress back end.

Symptoms

• You may see the WordPress ‘critical error’ message after installing or activating the premium add-on plugin. The problem typically affects the WordPress admin area, and parts of the site may stop loading correctly until the faulty plugin is disabled.
• This behaviour is consistent with a plugin compatibility problem, where the premium extension is not compatible with the installed version of the core plugin.

PHP fatal error caused by a method declaration mismatch between the core plugin and the premium add-on plugin.

Solution

1. Disable the premium add-on plugin to restore access to the site and WordPress admin area.
2. Check that the core plugin and the premium add-on are on compatible versions before re-enabling them.
3. If the issue returns after reactivation, update both plugins to matching supported versions recommended by the plugin vendor.
4. If no compatible update is available, contact the plugin vendor’s support team and provide the fatal error details so they can confirm the required version combination or supply a fix.