Title: Fatal error conflict with HyperDB
Last modified: January 4, 2018

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# Fatal error conflict with HyperDB

 *  [Abbson Studios](https://wordpress.org/support/users/abbson/)
 * (@abbson)
 * [8 years, 4 months ago](https://wordpress.org/support/topic/fatal-error-conflict-with-hyperdb/)
 * I’m getting the following fatal error when enabling HyperDB version 1.5:
 * `Fatal error: Uncaught W3TC\Util_Environment_Exceptions in /var/www/public_html/
   wp-content/plugins/w3-total-cache/Root_Environment.php:54 Stack trace: #0 /var/
   www/public_html/wp-content/plugins/w3-total-cache/Generic_Plugin.php(194): W3TC\
   Root_Environment->fix_on_event(Object(W3TC\Config), 'first_frontend', Object(
   W3TC\Config)) #1 /var/www/public_html/wp-includes/class-wp-hook.php(298): W3TC\
   Generic_Plugin->init('') #2 /var/www/public_html/wp-includes/class-wp-hook.php(
   323): WP_Hook->apply_filters(NULL, Array) #3 /var/www/public_html/wp-includes/
   plugin.php(453): WP_Hook->do_action(Array) #4 /var/www/public_html/wp-settings.
   php(448): do_action('init') #5 /var/www/public_html/wp-config.php(200): require_once('/
   var/www/vhosts...') #6 /var/www/public_html/wp-load.php(37): require_once('/var/
   www/vhosts...') #7 /var/www/public_html/wp-blog-header.php(13): require_once('/
   var/www/vhosts...') #8 /var/www/public_html/index.php(17): require('/var/www/
   vhosts...') #9 {main} thrown in /var/www/public_html/wp-content/plugins/w3-total-
   cache/Root_Environment.php on line 54`
 * When I comment out the file w3-total-cache/Generic_Plugin.php lines 193-194, 
   then things work.
 * Here are the lines in question:
 *     ```
       $environment->fix_on_event( $this->_config, 'first_frontend',
       	$this->_config );
       ```
   
 * This is a WordPress multisite install, which is updated to version 4.9.1, and
   W3TC is updated to version 0.9.6. If I rename HyperDB’s db.php, then things work.
   Change it back to db.php, then I get the above error message.

The topic ‘Fatal error conflict with HyperDB’ is closed to new replies.

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 * 0 replies
 * 1 participant
 * Last reply from: [Abbson Studios](https://wordpress.org/support/users/abbson/)
 * Last activity: [8 years, 4 months ago](https://wordpress.org/support/topic/fatal-error-conflict-with-hyperdb/)
 * Status: not resolved