Fatal error: Uncaught Error: Call to a member function GetCurrentUser() on null in /var/www/plato/data/www/plato.spbu.ru/CONFERENCES/2021/upt29.php:11
Stack trace:
#0 {main}
thrown in /var/www/plato/data/www/plato.spbu.ru/CONFERENCES/2021/upt29.php on line 11