WP 5.8.1 support

With upgrade to PHP 8 and WP 5.8.3:

Fatal error: Uncaught Error: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method WPRecentCommentsOptions::add() cannot be called statically?in?/wp-includes/class-wp-hook.php?on line?303
Call stack:
1. WP_Hook::apply_filters()?wp-includes/class-wp-hook.php:327
2. WP_Hook::do_action()?wp-includes/plugin.php:470
3. do_action()?wp-admin/includes/menu.php:155
4. require_once()?wp-admin/menu.php:341
5. require()?wp-admin/admin.php:158
6. require_once()?wp-admin/index.php:10
Query Monitor

• This reply was modified 3 years ago by ivano098.