diff --git a/core/lib/Drupal/Core/Render/MainContent/HtmlRenderer.php b/core/lib/Drupal/Core/Render/MainContent/HtmlRenderer.php
index c76a972..c378ffb 100644
--- a/core/lib/Drupal/Core/Render/MainContent/HtmlRenderer.php
+++ b/core/lib/Drupal/Core/Render/MainContent/HtmlRenderer.php
@@ -190,7 +190,7 @@ protected function prepare(array $main_content, Request $request, RouteMatchInte
     // Determine the title: use the title provided by the main content if any,
     // otherwise get it from the routing information.
     $get_title = function (array $main_content) use ($request, $route_match) {
-      return isset($main_content['#title']) ? $main_content['#title'] : $this->titleResolver->getTitle($request, $route_match->getRouteObject());
+      return isset($main_content['#title']) && !empty($main_content['#title']) ? $main_content['#title'] : $this->titleResolver->getTitle($request, $route_match->getRouteObject());
     };
 
     // If the _controller result already is #type => page,