diff --git a/src/lib/MVC/Symfony/Controller/Content/PreviewController.php b/src/lib/MVC/Symfony/Controller/Content/PreviewController.php
index a54454ebd5..7e208f497b 100644
--- a/src/lib/MVC/Symfony/Controller/Content/PreviewController.php
+++ b/src/lib/MVC/Symfony/Controller/Content/PreviewController.php
@@ -71,7 +71,7 @@ public function __construct(
         AuthorizationCheckerInterface $authorizationChecker,
         PreviewLocationProvider $locationProvider,
         CustomLocationControllerChecker $controllerChecker,
-        bool $debugMode,
+        bool $debugMode = false,
         ?LoggerInterface $logger = null
     ) {
         $this->contentService = $contentService;
@@ -212,9 +212,9 @@ private function buildResponseForGenericPreviewError(Location $location, Content
         try {
             if ($location->isDraft() && $this->controllerChecker->usesCustomController($content, $location)) {
                 $message = <<<EOF
-<p>The view that rendered this location draft uses a custom controller, and resulted in a fatal error.</p>
-<p>Location View is deprecated, as it causes issues with preview, such as an empty location id when previewing the first version of a content.</p>
-EOF;
+                    <p>The view that rendered this location draft uses a custom controller, and resulted in a fatal error.</p>
+                    <p>Location View is deprecated, as it causes issues with preview, such as an empty location id when previewing the first version of a content.</p>
+                    EOF;
             }
         } catch (Exception $innerException) {
             $message = 'An exception occurred when handling page preview exception';