Title: Fatal Error during update
Last modified: August 12, 2021

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# Fatal Error during update

 *  Resolved [karlabarton](https://wordpress.org/support/users/karlabarton/)
 * (@karlabarton)
 * [4 years, 10 months ago](https://wordpress.org/support/topic/fatal-error-during-update/)
 * I tried to do an update for Cerber Security and a fatal error occurred. I went
   into Recovery mode and deactivated the plugin. When I try to install and activate
   it again, I get this error:
 * Fatal error: Cannot use isset() on the result of an expression (you can use “
   null !== expression” instead) in /home/dogfoo5/public_html/wp-content/plugins/
   wp-cerber/cerber-common.php on line 2389
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ffatal-error-during-update%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

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

 *  Plugin Author [gioni](https://wordpress.org/support/users/gioni/)
 * (@gioni)
 * [4 years, 10 months ago](https://wordpress.org/support/topic/fatal-error-during-update/#post-14760359)
 * You need to update your PHP. See more: [https://wordpress.org/support/topic/critical-error-after-update-13/](https://wordpress.org/support/topic/critical-error-after-update-13/)
 *  Thread Starter [karlabarton](https://wordpress.org/support/users/karlabarton/)
 * (@karlabarton)
 * [4 years, 10 months ago](https://wordpress.org/support/topic/fatal-error-during-update/#post-14762583)
 * I was able to update PHP through my hosting company, and that fixed the problem.
 * Thank you very much!

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

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

 * ![](https://s.w.org/plugins/geopattern-icon/wp-cerber_77a9bf.svg)
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 * 2 replies
 * 2 participants
 * Last reply from: [karlabarton](https://wordpress.org/support/users/karlabarton/)
 * Last activity: [4 years, 10 months ago](https://wordpress.org/support/topic/fatal-error-during-update/#post-14762583)
 * Status: resolved