Fatal error: Uncaught TypeError: Unsupported operand types: string - int in /home/blabo/www/app/models/Produit.php:217 Stack trace: #0 /home/blabo/www/app/controllers/ProductController.php(148): App\models\Produit->getProductsByIdSousCategory() #1 [internal function]: App\controllers\ProductController->listBySubcategory() #2 /home/blabo/www/core/App.php(42): call_user_func_array() #3 /home/blabo/www/public/index.php(18): Core\App->__construct() #4 {main} thrown in /home/blabo/www/app/models/Produit.php on line 217