Title: Fatal Error 504
Last modified: February 2, 2017

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# Fatal Error 504

 *  Resolved [jasonkarn](https://wordpress.org/support/users/jasonkarn/)
 * (@jasonkarn)
 * [9 years, 3 months ago](https://wordpress.org/support/topic/fatal-error-504-2/)
 * Rene,
 * Every time I try to use this plugin, I get the following error. I’ve tried disabling
   all plugins through the optimizer and from the plugin page, but I still get the
   error. Any suggestions?
 * Fatal Error: This should not happen but is most often caused by other plugins.
   Try first the option “Optimizer” in WP Staging->Settings and try again. If this
   does not help, enable wordpress debug mode to find out which plugin is causing
   this: 504 error
 * Thanks,
 * Jason

Viewing 3 replies - 1 through 3 (of 3 total)

 *  Plugin Author [Rene Hermenau](https://wordpress.org/support/users/renehermi/)
 * (@renehermi)
 * [9 years, 3 months ago](https://wordpress.org/support/topic/fatal-error-504-2/#post-8733853)
 * Do you have any js errors in the console while cloning?
    You can check this with
   pressing F12 in chrome: [http://take.ms/4FZtg](http://take.ms/4FZtg)
 *  Thread Starter [jasonkarn](https://wordpress.org/support/users/jasonkarn/)
 * (@jasonkarn)
 * [9 years, 3 months ago](https://wordpress.org/support/topic/fatal-error-504-2/#post-8735175)
 * Here’s what I get in the console-
 * [https://www.totalhipaa.com/wp-admin/admin-ajax.php](https://www.totalhipaa.com/wp-admin/admin-ajax.php)
   Failed to load resource: the server responded with a status of 504 ()
    wpstg-
   admin.min.js?ver=1.1.3:1 504 error wpstg-admin.min.js?ver=1.1.3:1 Fatal Error:
   This should not happen but is most often caused by other plugins. Try first the
   option “Optimizer” in WP Staging->Settings and try again. If this does not help,
   enable [wordpress debug mode](https://codex.wordpress.org/Debugging_in_WordPress)
   to find out which plugin is causing this: 504 error sw?s=push:1 Service Worker
   termination by a timeout timer was canceled because DevTools is attached.
 * Thanks for you quick response!
 * Jason
 *  Plugin Author [Rene Hermenau](https://wordpress.org/support/users/renehermi/)
 * (@renehermi)
 * [9 years, 3 months ago](https://wordpress.org/support/topic/fatal-error-504-2/#post-8738430)
 * Hi Jason,
 * have you tried the optimizer and excluded all plugins there? [http://take.ms/5FRWM](http://take.ms/5FRWM)
 * Also install the query monitor plugin and check if there are any php errors on
   your site

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘Fatal Error 504’ is closed to new replies.

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## Tags

 * [504 Error](https://wordpress.org/support/topic-tag/504-error/)

 * 3 replies
 * 2 participants
 * Last reply from: [Rene Hermenau](https://wordpress.org/support/users/renehermi/)
 * Last activity: [9 years, 3 months ago](https://wordpress.org/support/topic/fatal-error-504-2/#post-8738430)
 * Status: resolved