Title: Internal Server Error
Last modified: April 18, 2023

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# Internal Server Error

 *  [nicole0155](https://wordpress.org/support/users/nicole0155/)
 * (@nicole0155)
 * [3 years, 1 month ago](https://wordpress.org/support/topic/internal-server-error-707/)
 * Dear Support Team,
 * 
   After a full reinstall of our system (with a php upgrade also), all seems running
   fine, except for Query Monitor Plugin. If we activate the plugin “Query Monitor”
   we get a blank page with “Internal Server Error” message accessing the website
   url.
 * 
   The admin panel is working normally and it shows the query monitor data as well
   as the cached pages for non admin users.
 * 
   We are using PHP version: 8.2.4, WordPress 6.2, MariaDB 10.5.19, WooCommerce
   7.6.0 and several plugins are in use. The same plugins we used before with the
   query monitor working”.
 * 
   We did not see any WooCommerce error log. Server logs are showing only a few
   messages (see bellow).
 * We have made a clean plugin reinstall, but the critical error remains.
 * 
   Can you Help?Many thanks.
 * php82-fpm/error.log
 * WARNING: [pool ] child 2806 said into stderr: “PHP message: PHP Fatal error: 
   Uncaught Error: Class “QM_Timer” not found in /httpdocs/wp-content/plugins/query-
   monitor/classes/Collectors.php:81″
 * WARNING: [pool ] child 2806 said into stderr: “#0 /httpdocs/wp-content/plugins/
   query-monitor/classes/Dispatcher.php(108): QM_Collectors->process()”
 * WARNING: [pool ] child 2806 said into stderr: “#1 /httpdocs/wp-content/plugins/
   query-monitor/dispatchers/AJAX.php(53): QM_Dispatcher->get_outputters()”
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Finternal-server-error-707%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Thread Starter [nicole0155](https://wordpress.org/support/users/nicole0155/)
 * (@nicole0155)
 * [3 years, 1 month ago](https://wordpress.org/support/topic/internal-server-error-707/#post-16673805)
 * Dear Support Team,
 * Just to add that the plugin Query Monitor is working in all website, being the
   error only at the homepage.
 * Thanks.
 *  Plugin Author [John Blackbourn](https://wordpress.org/support/users/johnbillion/)
 * (@johnbillion)
 * WordPress Core Developer
 * [3 years, 1 month ago](https://wordpress.org/support/topic/internal-server-error-707/#post-16687034)
 * Thanks for the report.
 * I think this is caused when a PHP error is triggered during the PHP class autoloading,
   but I’ve yet to figure it out exactly.

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘Internal Server Error’ is closed to new replies.

 * ![](https://ps.w.org/query-monitor/assets/icon.svg?rev=2994095)
 * [Query Monitor](https://wordpress.org/plugins/query-monitor/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/query-monitor/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/query-monitor/)
 * [Active Topics](https://wordpress.org/support/plugin/query-monitor/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/query-monitor/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/query-monitor/reviews/)

 * 2 replies
 * 2 participants
 * Last reply from: [John Blackbourn](https://wordpress.org/support/users/johnbillion/)
 * Last activity: [3 years, 1 month ago](https://wordpress.org/support/topic/internal-server-error-707/#post-16687034)
 * Status: not resolved