Title: PHP error on PHP 8.0
Last modified: July 13, 2022

---

# PHP error on PHP 8.0

 *  Resolved [Juuso Turunen](https://wordpress.org/support/users/juusoturunen/)
 * (@juusoturunen)
 * [3 years, 10 months ago](https://wordpress.org/support/topic/php-error-on-php-8-0/)
 * Hello!
 * I tried to switch from PHP 7.4 to PHP 8.0 but I got a WP critical error page 
   and the following to my email:
 *     ```
       Tiedoston /PATH/TO/MY/WP/INSTALLATION/wp-content/plugins/wp-smushit/lib/class-wp-smush.php rivillä 1206 havaittiin virhe lajia E_ERROR. Virheviesti: Uncaught ValueError: version_compare(): Argument #3 ($operator) must be a valid comparison operator in /PATH/TO/MY/WP/INSTALLATION/wp-content/plugins/wp-smushit/lib/class-wp-smush.php:1206
       Stack trace:
       #0 /PATH/TO/MY/WP/INSTALLATION/wp-content/plugins/wp-smushit/lib/class-wp-smush.php(1206): version_compare()
       #1 /PATH/TO/MY/WP/INSTALLATION/wp-content/plugins/wp-smushit/lib/class-wp-smush.php(172): WpSmush->migrate()
       #2 /PATH/TO/MY/WP/INSTALLATION/wp-includes/class-wp-hook.php(307): WpSmush->admin_init()
       #3 /PATH/TO/MY/WP/INSTALLATION/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters()
       #4 /PATH/TO/MY/WP/INSTALLATION/wp-includes/plugin.php(476): WP_Hook->do_action()
       #5 /PATH/TO/MY/WP/INSTALLATION/wp-admin/admin.php(175): do_action()
       #6 /PATH/TO/MY/WP/INSTALLATION/wp-admin/options-general.php(10): require_once('...')
       #7 {main}
         thrown
       ```
   
 * Kindly,
    Juuso

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

 *  Thread Starter [Juuso Turunen](https://wordpress.org/support/users/juusoturunen/)
 * (@juusoturunen)
 * [3 years, 10 months ago](https://wordpress.org/support/topic/php-error-on-php-8-0/#post-15822643)
 * Sorry… I noticed that for some reason I had a really old version. Updated it 
   and now should work.
 *  [Kris – WPMU DEV Support](https://wordpress.org/support/users/wpmudevsupport13/)
 * (@wpmudevsupport13)
 * [3 years, 10 months ago](https://wordpress.org/support/topic/php-error-on-php-8-0/#post-15824535)
 * Hi [@juusoturunen](https://wordpress.org/support/users/juusoturunen/)
 * I hope you are doing good today.
 * Thank you for updating us on this issue.
 * Kind Regards,
    Kris

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

The topic ‘PHP error on PHP 8.0’ is closed to new replies.

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## Tags

 * [PHP 8.0](https://wordpress.org/support/topic-tag/php-8-0/)
 * [php-error](https://wordpress.org/support/topic-tag/php-error/)

 * 2 replies
 * 2 participants
 * Last reply from: [Kris – WPMU DEV Support](https://wordpress.org/support/users/wpmudevsupport13/)
 * Last activity: [3 years, 10 months ago](https://wordpress.org/support/topic/php-error-on-php-8-0/#post-15824535)
 * Status: resolved