admin: fix new document category

src/Bundle/ChillDocStoreBundle/Controller/DocumentCategoryController.php

@@ -102,10 +102,18 @@ class DocumentCategoryController extends AbstractController
     public function new(Request $request): Response
     {
         $em = $this->getDoctrine()->getManager();
+
+        $nextId = $em
+            ->createQuery(
+                'SELECT MAX(c.idInsideBundle) + 1 FROM ChillDocStoreBundle:DocumentCategory c'
+            )
+            ->getSingleResult();
+
         $documentCategory = new DocumentCategory(
             ChillDocStoreBundle::class,
-            $em->getRepository(DocumentCategory::class)->nextIdInsideBundle()
+            reset($nextId)
         );
+
         $documentCategory
             ->setDocumentClass(PersonDocument::class);
 
@@ -120,8 +128,6 @@ class DocumentCategoryController extends AbstractController
             return $this->redirectToRoute('document_category_index');
         }
 
-        $documentCategory->setBundleId(ChillDocStoreBundle::class);
-
         return $this->render('ChillDocStoreBundle:DocumentCategory:new.html.twig', [
             'document_category' => $documentCategory,
             'form' => $form->createView(),