Thank you for this... Your message directed me to check php version that is used on the website.

I have more websites on the same server, and they all use PHP7.4 but this one was use PHP8.1. When I switched back to 7.4, all is up and running again

The conclusion is: It doesn't work with PHP8.1 (I didn't check PHP8.0)

Thank you.

Thank you for your fast response...

Sorry, it is a Fatal error, not Critical...

Here is my debug

Fatal error: Uncaught Error: Call to undefined function error_log() in /home/sbb23215/public_html/portal/wp-includes/class-wpdb.php:1602 Stack trace: #0 /home/sbb23215/public_html/portal/wp-includes/class-wpdb.php(2128): wpdb->print_error() #1 /home/sbb23215/public_html/portal/wp-includes/class-wpdb.php(2854): wpdb->query('select \n\t\t\t\t\tco...') #2 /home/sbb23215/public_html/portal/wp-content/plugins/fulltext-search/includes/wpfts_db.php(42): wpdb->get_results('select \n\t\t\t\t\tco...', 'ARRAY_A') #3 /home/sbb23215/public_html/portal/wp-content/plugins/fulltext-search/includes/wpfts_index.php(1866): WPFTS_DB->get_results('select \n\t\t\t\t\tco...', 'ARRAY_A') #4 /home/sbb23215/public_html/portal/wp-content/plugins/fulltext-search/includes/wpfts_core.php(863): WPFTS_Index->get_status() #5 /home/sbb23215/public_html/portal/wp-content/plugins/fulltext-search/fulltext-search.php(207): WPFTS_Core->get_status() #6 /home/sbb23215/public_html/portal/wp-includes/class-wp-hook.php(308): wpfts_custom_js('') #7 /home/sbb23215/public_html/portal/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(NULL, Array) #8 /home/sbb23215/public_html/portal/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #9 /home/sbb23215/public_html/portal/wp-admin/admin-header.php(163): do_action('admin_head') #10 /home/sbb23215/public_html/portal/wp-admin/plugins.php(605): require_once('/home/sbb23215/...') #11 {main} thrown in /home/sbb23215/public_html/portal/wp-includes/class-wpdb.php on line 1602
Постоји критична грешка на вашем веб месту. Молимо вас да проверите сандуче своје управљачке е-поште за упутства.

Сазнајте више о отклањању грешака Вордпресу.

It is a Serbian Cyrilic site, but on the other site (older one same Cyrillic) plugin still works perfectly.

Thx