Erreur 404 Etablissement introuvable

producer/components/ProducerView.php

     var $subtitle ;
     
     public function getProducer() {
-        return Etablissement::findOne(['slug' => Yii::$app->getRequest()->getQueryParam('slug_producer')]) ;        
+        $etablissement = Etablissement::findOne(['slug' => Yii::$app->getRequest()->getQueryParam('slug_producer')]) ;
+        if($etablissement)
+            return $etablissement;
+        else
+            throw new \yii\web\HttpException(404, 'Etablissement introuvable');
     }
     
     public function setTitle($title, $icon = '') {

producer/controllers/ProducerController.php

         return [
             'error' => [
                 'class' => 'yii\web\ErrorAction',
+                
             ],
         ];
     }