It’s version 5.8, free version.
The error message is this:
Fatal error: Uncaught TypeError: mysqli_num_fields(): Argument #1 ($result) must be of type mysqli_result, bool given in /home/agritech/www/beta.agritech-ag.ch/wp-includes/class-wpdb.php:3868 Stack trace: #0 /home/agritech/www/beta.agritech-ag.ch/wp-includes/class-wpdb.php(3868): mysqli_num_fields(false) #1 /home/agritech/www/beta.agritech-ag.ch/wp-includes/class-wpdb.php(780): wpdb->load_col_info() #2 /home/agritech/www/beta.agritech-ag.ch/wp-content/plugins/w3-total-cache/DbCache_WpdbInjection_QueryCaching.php(218): wpdb->__get(‘col_info’) #3 /home/agritech/www/beta.agritech-ag.ch/wp-content/plugins/w3-total-cache/DbCache_WpdbNew.php(122): W3TC\DbCache_WpdbInjection_QueryCaching->query(‘DESCRIBE IF;’) #4 /home/agritech/www/beta.agritech-ag.ch/wp-includes/class-wpdb.php(3146): W3TC\DbCache_WpdbNew->query(‘DESCRIBE IF;’) #5 /home/agritech/www/beta.agritech-ag.ch/wp-admin/includes/upgrade.php(2897): wpdb->get_results(‘DESCRIBE IF;’) #6 /home/agritech/www/beta.agritech-ag.ch/wp-content/plugins/team-showcase-supreme/settings/helper/functions.php(632): dbDelta(Array) #7 /home/agritech/www/beta.agritech-ag.ch/wp-content/plugins/team-showcase-supreme/index.php(101): wpm_6310_check_field_exists() #8 /home/agritech/www/beta.agritech-ag.ch/wp-includes/class-wp-hook.php(324): wpm_6310_plugin_update_check(”) #9 /home/agritech/www/beta.agritech-ag.ch/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #10 /home/agritech/www/beta.agritech-ag.ch/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #11 /home/agritech/www/beta.agritech-ag.ch/wp-settings.php(550): do_action(‘plugins_loaded’) #12 /home/agritech/www/beta.agritech-ag.ch/wp-config.php(85): require_once(‘/home/agritech/…’) #13 /home/agritech/www/beta.agritech-ag.ch/wp-load.php(50): require_once(‘/home/agritech/…’) #14 /home/agritech/www/beta.agritech-ag.ch/wp-blog-header.php(13): require_once(‘/home/agritech/…’) #15 /home/agritech/www/beta.agritech-ag.ch/index.php(17): require(‘/home/agritech/…’) #16 {main} thrown in /home/agritech/www/beta.agritech-ag.ch/wp-includes/class-wpdb.php on line 3868
And if I deactivate the plugin, the website works again normal.
Thank you.