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PHP Fatal error: Uncaught Error: Class “WP_Upgrader” not found in /var/www/html/wp-content/mu-plugins/index-wp-mysql-for-speed-update-filter.php:32\nStack trace:\n#0 /var/www/html/wp-includes/class-wp-hook.php(307): index_mysql_for_speed_upgrade_filter(Array)\n#1 /var/www/html/wp-includes/plugin.php(191): WP_Hook->apply_filters(Array, Array)\n#2 /var/www/html/wp-admin/includes/upgrade.php(2746): apply_filters(‘dbdelta_queries’, Array)\n#3 /var/www/html/wp-content/plugins/woocommerce-ajax-filters/main.php(2223): dbDelta(Array)\n#4 /var/www/html/wp-content/plugins/woocommerce-ajax-filters/main.php(1558): BeRocket_AAPF->create_berocket_term_table()\n#5 /var/www/html/wp-includes/class-wp-hook.php(307): BeRocket_AAPF->admin_init(”)\n#6 /var/www/html/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)\n#7 /var/www/html/wp-includes/plugin.php(476): WP_Hook->do_action(Array)\n#8 /var/www/html/wp-admin/admin-ajax.php(45): do_action(‘admin_init’)\n#9 {main}\n thrown in /var/www/html/wp-content/mu-plugins/index-wp-mysql-for-speed-update-filter.php on line 32