Internal error when editing Woocommerce product with Quick Edit function

I receive the following error when editing a Woocommerce product from Products > Quick edit and then clicking “Save changes”.

2020/10/28 19:14:39 [error] 22103#22103: *1625643 FastCGI sent in stderr: "PHP message: PHP Fatal error:  Uncaught Error: Object of class WP_Post_Type could not be converted to string in /var/www/{url}/wp-content/plugins/seo-by-rank-math/includes/admin/class-post-columns.php:129
Stack trace:
#0 /var/www/{url}.nl/wp-includes/class-wp-hook.php(287): RankMath\Admin\Post_Columns->add_columns()
#1 /var/www/{url}.nl/wp-includes/plugin.php(206): WP_Hook->apply_filters()
#2 /var/www/{url}.nl/wp-admin/includes/class-wp-posts-list-table.php(695): apply_filters()
#3 /var/www/{url}.nl/wp-includes/class-wp-hook.php(287): WP_Posts_List_Table->get_columns()
#4 /var/www/{url}.nl/wp-includes/plugin.php(206): WP_Hook->apply_filters()
#5 /var/www/{url}.nl/wp-admin/includes/screen.php(37): apply_filters()
#6 /var/www/{url}.nl/wp-admin/includes/class-wp-list-table.php(1087): get_column_headers()
#7 /var/www/{url}.nl/wp-admin/includes/class-wp-list-table.php(1373): WP_List_Table->get_column_info()
#8 /var/www/{url}.nl/wp" while reading response header from upstream, client: 86.82.38.153, server: {url}.nl, request: "POST /wp-admin/admin-ajax.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php7.4-fpm.sock:", host: "{url}.nl", referrer: "https://{url}.nl/wp-admin/edit.php?post_type=product"

Browser console:
Failed to load resource: the server responded with a status of 500 () https://{url}.nl/wp-admin/admin-ajax.php

Server:
NGINX, PHP7.4-FPM

Wordpress:
WP 5.5, Rank Math 1.0.50.1, Woocommerce 4.6.1

Do you have any suggestions on where to look at when debugging this issue?

Thanks!

• This topic was modified 3 years, 9 months ago by Noëll Taravati.