core/lib/Drupal/Core/Render/BareHtmlPageRenderer.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/core/lib/Drupal/Core/Render/BareHtmlPageRenderer.php b/core/lib/Drupal/Core/Render/BareHtmlPageRenderer.php
index bf05a3d..0920eef 100644
--- a/core/lib/Drupal/Core/Render/BareHtmlPageRenderer.php
+++ b/core/lib/Drupal/Core/Render/BareHtmlPageRenderer.php
@@ -59,12 +59,12 @@ public function renderBarePage(array $content, $title, $page_theme_property, arr
     // \Drupal\Core\Render\MainContent\HtmlRenderer::renderResponse() for more
     // information about this; the exact same pattern is used there and
     // explained in detail there.
-    $this->renderer->render($html['page'], TRUE);
+    $this->renderer->renderRoot($html['page']);
 
     // Add the bare minimum of attachments from the system module and the
     // current maintenance theme.
     system_page_attachments($html['page']);
-    return $this->renderer->render($html);
+    return $this->renderer->renderPlain($html);
   }
 
 }