diff --git a/core/modules/content_translation/lib/Drupal/content_translation/ContentTranslationController.php b/core/modules/content_translation/lib/Drupal/content_translation/ContentTranslationController.php
index a639f30..634043b 100644
--- a/core/modules/content_translation/lib/Drupal/content_translation/ContentTranslationController.php
+++ b/core/modules/content_translation/lib/Drupal/content_translation/ContentTranslationController.php
@@ -234,7 +234,14 @@ public function entityFormAlter(array &$form, array &$form_state, EntityInterfac
         );
       }
 
-      $name = $new_translation ? $GLOBALS['user']->getUsername() : user_load($entity->translation[$form_langcode]['uid'])->getUsername();
+      // Default to the anonymous user.
+      $name = '';
+      if ($new_translation) {
+        $name = $GLOBALS['user']->getUsername();
+      }
+      elseif ($entity->translation[$form_langcode]['uid']) {
+        $name = user_load($entity->translation[$form_langcode]['uid'])->getUsername();
+      }
       $form['content_translation']['name'] = array(
         '#type' => 'textfield',
         '#title' => t('Authored by'),