Warning: Undefined array key "id_utente" in /var/www/vhosts/livesurgexchange.it/httpdocs/src/html/sidebar.php on line 8

Fatal error: Uncaught TypeError: Models_Utente::fetchById(): Argument #2 ($_id) must be of type int, null given, called in /var/www/vhosts/livesurgexchange.it/httpdocs/src/html/sidebar.php on line 8 and defined in /var/www/vhosts/livesurgexchange.it/httpdocs/Models/Utente.php:43 Stack trace: #0 /var/www/vhosts/livesurgexchange.it/httpdocs/src/html/sidebar.php(8): Models_Utente::fetchById() #1 /var/www/vhosts/livesurgexchange.it/httpdocs/Views/404.php(21): include('...') #2 /var/www/vhosts/livesurgexchange.it/httpdocs/Classes/Router.php(32): include('...') #3 /var/www/vhosts/livesurgexchange.it/httpdocs/index.php(164): Classes_Router->dispatch() #4 {main} thrown in /var/www/vhosts/livesurgexchange.it/httpdocs/Models/Utente.php on line 43