diff --git a/core/modules/system/src/Controller/BatchController.php b/core/modules/system/src/Controller/BatchController.php
index 2e01c5b..dcf08c4 100644
--- a/core/modules/system/src/Controller/BatchController.php
+++ b/core/modules/system/src/Controller/BatchController.php
@@ -61,7 +61,7 @@ public function batchPage(Request $request) {
       return $output;
     }
     elseif (isset($output)) {
-      $title = isset($output['#title']) ? $output['#title'] : NULL;
+      $title = isset($output['#title']) ? $output['#title'] : '';
       $page = [
         '#type' => 'page',
         '#title' => $title,
@@ -69,7 +69,7 @@ public function batchPage(Request $request) {
         'content' => $output,
       ];
 
-      // Also inject title as a page header (if available).
+      // Place the title in the header region.
       if ($title) {
         $page['header'] = [
           '#type' => 'page_title',