Warning: Undefined array key "id" in /var/www/html/Application/controllers/Home.php on line 24

Fatal error: Uncaught TypeError: Application\models\Users::findById(): Argument #1 ($id) must be of type int, null given, called in /var/www/html/Application/controllers/Home.php on line 23 and defined in /var/www/html/Application/models/Users.php:21 Stack trace: #0 /var/www/html/Application/controllers/Home.php(23): Application\models\Users::findById(NULL) #1 [internal function]: Home->index() #2 /var/www/html/Application/core/App.php(21): call_user_func_array(Array, Array) #3 /var/www/html/public/index.php(58): Application\core\App->__construct() #4 {main} thrown in /var/www/html/Application/models/Users.php on line 21