diff --git a/core/lib/Drupal/Core/Config/Entity/ConfigStorageController.php b/core/lib/Drupal/Core/Config/Entity/ConfigStorageController.php
index 824d18e..422c13f 100644
--- a/core/lib/Drupal/Core/Config/Entity/ConfigStorageController.php
+++ b/core/lib/Drupal/Core/Config/Entity/ConfigStorageController.php
@@ -350,7 +350,7 @@ public function save(EntityInterface $entity) {
 
     // If the entity is new but a config file for it already exists, prevent
     // it to be overwritten.
-    if ($entity->isNew() && !$config->isNew()) {
+    if ($entity->isNew() && !$is_new) {
       throw new EntityStorageException(String::format('@type entity with ID @id already exists.', array('@type' => $this->entityType, '@id' => $id)));
     }