diff --git a/core/modules/views/views.module b/core/modules/views/views.module
index 1675084..87dd984 100644
--- a/core/modules/views/views.module
+++ b/core/modules/views/views.module
@@ -672,10 +672,11 @@ function views_pre_render_views_form_views_form($element) {
 
   // Sort, render and add remaining form fields.
   $children = Element::children($element, TRUE);
-  foreach ($children as $key => $child) {
-    $children[$key] = render($element[$key]);
+  $form_fields_output = '';
+  foreach ($children as $key) {
+    $form_fields_output .= render($element[$key]);
   }
-  $element['#children'] = $children;
+  $element['#children'] = SafeMarkup::set($form_fields_output);
 
   return $element;
 }