Fatal error: Uncaught Error: Call to undefined function is_main_site() in /var/www/u0095192/public_html/garantbezopasnosti.ru/wp-includes/update.php:739
Stack trace:
#0 {main}
thrown in /var/www/u0095192/public_html/garantbezopasnosti.ru/wp-includes/update.php on line 739