diff --git a/backend/src/Api/Local/TemplateController.php b/backend/src/Api/Local/TemplateController.php
index 1c75311c..da1c2867 100644
--- a/backend/src/Api/Local/TemplateController.php
+++ b/backend/src/Api/Local/TemplateController.php
@@ -24,7 +24,6 @@
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\Routing\Attribute\Route;
 use Twig\Environment;
-use function PHPUnit\Framework\assertNotNull;
 
 /**
  * @codeCoverageIgnore
@@ -56,7 +55,7 @@ public function __construct(
     public function basicTemplate(): Response
     {
         $newsletter = $this->em->getRepository(Newsletter::class)->find(1);
-        assertNotNull($newsletter);
+        assert($newsletter !== null);
         $meta = $newsletter->getMeta();
         $meta->address = '10 Rue de Penthievre, 75008 Paris, France';
         //$meta->unsubscribe_text = 'Unsubscribe.';
diff --git a/backend/src/Service/Template/TextTemplateRenderer.php b/backend/src/Service/Template/TextTemplateRenderer.php
index 35ba40ef..2fba0150 100644
--- a/backend/src/Service/Template/TextTemplateRenderer.php
+++ b/backend/src/Service/Template/TextTemplateRenderer.php
@@ -5,7 +5,6 @@
 use App\Entity\Issue;
 use App\Entity\Send;
 use App\Service\Content\ContentService;
-use function PHPUnit\Framework\assertNotNull;
 
 class TextTemplateRenderer
 {
@@ -32,7 +31,7 @@ public function renderFromSend(Send $send): string
 
     public function renderFromIssue(Issue $issue): string
     {
-        assertNotNull($issue->getContent());
+        assert($issue->getContent() !== null);
 
         $variables = $this->templateVariableService->variablesFromIssue($issue);