diff -u b/core/lib/Drupal/Core/Render/Element/RenderElement.php b/core/lib/Drupal/Core/Render/Element/RenderElement.php
--- b/core/lib/Drupal/Core/Render/Element/RenderElement.php
+++ b/core/lib/Drupal/Core/Render/Element/RenderElement.php
@@ -448,8 +448,8 @@
       $group = $element['#group'];
       $groups[$group][] = &$element;
       // Set group element as required too.
-      if (isset($element["widget"])){
-        if ($element["widget"]['#required']){
+      if (isset($element["widget"])) {
+        if ($element["widget"]['#required']) {
           $complete_form[$group]['#required'] = TRUE;
         }
       }