diff --git a/core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/UniqueFieldValueValidator.php b/core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/UniqueFieldValueValidator.php
index b8e44c5..9a03fd1 100644
--- a/core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/UniqueFieldValueValidator.php
+++ b/core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/UniqueFieldValueValidator.php
@@ -30,7 +30,7 @@ public function validate($items, Constraint $constraint) {
     $id_key = $entity->getEntityType()->getKey('id');
 
     $values = array();
-    foreach ($values as $items->getIterators() as $item) {
+    foreach ($items->getIterators() as $item) {
       $values[] = $item->value;
     }
     $value_taken = (bool) \Drupal::entityQuery($entity_type_id)