diff -u b/core/modules/node/lib/Drupal/node/Plugin/field/widget/TitleWidget.php b/core/modules/node/lib/Drupal/node/Plugin/field/widget/TitleWidget.php
--- b/core/modules/node/lib/Drupal/node/Plugin/field/widget/TitleWidget.php
+++ b/core/modules/node/lib/Drupal/node/Plugin/field/widget/TitleWidget.php
@@ -48,7 +48,7 @@
     $addition[$field_name] = array(
       '#type' => 'textfield',
       '#title' => check_plain($label),
-      '#required' => $items->isRequired(),
+      '#required' => $this->fieldDefinition->isFieldRequired(),
       '#default_value' => isset($items[0]->value) ? $items[0]->value : '',
       '#maxlength' => $this->fieldDefinition->getFieldSetting('max_length'),
     );