diff --git a/core/modules/node/lib/Drupal/node/NodeFormController.php b/core/modules/node/lib/Drupal/node/NodeFormController.php
index a0e5230..9a852eb 100644
--- a/core/modules/node/lib/Drupal/node/NodeFormController.php
+++ b/core/modules/node/lib/Drupal/node/NodeFormController.php
@@ -310,7 +310,7 @@ public function validate(array $form, array &$form_state) {
     }
 
     // Validate the "authored by" field.
-    if (!empty($form_state['values']['uid']) && !(user_load_by_name($form_state['values']['uid']))) {
+    if (!empty($form_state['values']['uid']) && !user_load_by_name($form_state['values']['uid'])) {
       // The use of empty() is mandatory in the context of usernames
       // as the empty string denotes the anonymous user. In case we
       // are dealing with an anonymous user we set the user ID to 0.