Title: PHP Fatal Error
Last modified: December 1, 2021

---

# PHP Fatal Error

 *  Resolved [Toni Guga](https://wordpress.org/support/users/gugan/)
 * (@gugan)
 * [4 years, 6 months ago](https://wordpress.org/support/topic/php-fatal-error-280/)
 * Hi there after upgrading to php 8 yost is giving fatal error, and many backend
   like product list of woocommerce is getting error 500. Any help?
 *     ```
       [01-Dec-2021 10:36:12 UTC] PHP Fatal error:  Uncaught TypeError: array_merge(): Argument #1 must be of type array, null given in /srv/data/web/vhosts/--sitedir--/htdocs/wp-content/plugins/wordpress-seo/admin/class-meta-columns.php:105
       Stack trace:
       #0 /srv/data/web/vhosts/--sitedir--/htdocs/wp-content/plugins/wordpress-seo/admin/class-meta-columns.php(105): array_merge()
       #1 /srv/data/web/vhosts/--sitedir--/htdocs/wp-includes/class-wp-hook.php(303): WPSEO_Meta_Columns->column_heading()
       #2 /srv/data/web/vhosts/--sitedir--/htdocs/wp-includes/plugin.php(189): WP_Hook->apply_filters()
       #3 /srv/data/web/vhosts/--sitedir--/htdocs/wp-admin/includes/class-wp-posts-list-table.php(739): apply_filters()
       #4 /srv/data/web/vhosts/--sitedir--/htdocs/wp-includes/class-wp-hook.php(303): WP_Posts_List_Table->get_columns()
       #5 /srv/data/web/vhosts/--sitedir--/htdocs/wp-includes/plugin.php(189): WP_Hook->apply_filters()
       #6 /srv/data/web/vhosts/--sitedir--/htdocs/wp-admin/includes/screen.php(37): apply_filters()
       #7 /srv/data/web/vhosts/--sitedir--/htdocs/wp-admin/includes/class-wp-screen.php(995): get_column_headers()
       #8 /srv/data/web/vhosts/--sitedir--/htdocs/wp-admin/includes/class-wp-screen.php(956): WP_Screen->show_screen_options()
       #9 /srv/data/web/vhosts/--sitedir--/htdocs/wp-admin/admin-header.php(265): WP_Screen->render_screen_meta()
       #10 /srv/data/web/vhosts/--sitedir--/htdocs/wp-admin/edit.php(396): require_once('...')
       #11 {main}
       ```
   

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

 *  Plugin Support [Maybellyne](https://wordpress.org/support/users/maybellyne/)
 * (@maybellyne)
 * [4 years, 6 months ago](https://wordpress.org/support/topic/php-fatal-error-280/#post-15121283)
 * Hello Gugan,
 * We are sorry about the issue you experienced with our plugin and PHP 8. Unfortunately,
   we haven’t yet fully tested the plugin with PHP version 8. The entire WordPress
   community is still working on it. You can read the [https://developer.yoast.com/blog/the-2020-wordpress-and-php-8-compatibility-report/](https://developer.yoast.com/blog/the-2020-wordpress-and-php-8-compatibility-report/).
 * For Yoast SEO to run properly, you should have a PHP version of 5.6.20 or higher.
   In fact, we recommend PHP version 7.3 or above. Before you upgrade to a higher
   PHP version, [check if your WordPress site is ready](https://yoast.com/help/site-ready-php-7/)
   for it. Read [this helpful article](https://yoast.com/help/how-to-update-your-php-version/)
   to learn how to update your PHP version. Also, your [PHP memory](https://yoast.com/help/fatal-error-allowed-memory-exhausted/)
   should be 256M or greater.
 * Thank you.
 *  Plugin Support [Michael Tiña](https://wordpress.org/support/users/mikes41720/)
 * (@mikes41720)
 * [4 years, 6 months ago](https://wordpress.org/support/topic/php-fatal-error-280/#post-15149663)
 * Hi,
 * This thread has been marked as resolved due to lack of activity by original poster.
 * If you are not the original poster but have a similar issue, please [open a new request](https://wordpress.org/support/plugin/wordpress-seo#new-post).

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

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

 * ![](https://ps.w.org/wordpress-seo/assets/icon-256x256.gif?rev=3419908)
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 * 2 replies
 * 3 participants
 * Last reply from: [Michael Tiña](https://wordpress.org/support/users/mikes41720/)
 * Last activity: [4 years, 6 months ago](https://wordpress.org/support/topic/php-fatal-error-280/#post-15149663)
 * Status: resolved