Correctif : Binding entities to query parameters only allowed for entities that have an identifier.

Controller/Product/ProductFamilyAdminController.php

             $productFamilies[] = $productFamilyDto->getInstance();
         }
 
-        $this->getProductFamilyContainer()->getStore()
-            ->setSection($this->getSectionCurrentDefault())
-            ->getWithReductions($productFamilies);
+        if($responseParameters->get('pageName') != 'new') {
+            $this->getProductFamilyContainer()->getStore()
+                ->setSection($this->getSectionCurrentDefault())
+                ->getWithReductions($productFamilies);
+        }
 
         // affichage du filtre sur section
         $responseParameters->set('display_switch_section', true);