Warning: Trying to access array offset on value of type null in /var/www/html/src/controllers/ProductsController.php on line 51

Fatal error: Uncaught TypeError: App\models\ManagerCategories::getSubCategory(): Argument #1 ($categoryID) must be of type int, null given, called in /var/www/html/src/controllers/ProductsController.php on line 51 and defined in /var/www/html/src/models/ManagerCategories.php:77 Stack trace: #0 /var/www/html/src/controllers/ProductsController.php(51): App\models\ManagerCategories->getSubCategory(NULL, 'khac') #1 /var/www/html/src/controllers/RouterController.php(86): App\controllers\ProductsController->display(Array) #2 /var/www/html/index.php(19): App\controllers\RouterController->display(Array) #3 {main} thrown in /var/www/html/src/models/ManagerCategories.php on line 77