diff --git a/core/lib/Drupal/Core/Config/Config.php b/core/lib/Drupal/Core/Config/Config.php
index b345da6..a1aae84 100644
--- a/core/lib/Drupal/Core/Config/Config.php
+++ b/core/lib/Drupal/Core/Config/Config.php
@@ -450,7 +450,7 @@ public static function validateName($name) {
       ));
     }
     // The object name must be fewer than Config::MAX_NAME_LENGTH characters.
-    if (strlen($this->name) > self::MAX_NAME_LENGTH) {
+    if (strlen($name) > self::MAX_NAME_LENGTH) {
       throw new ConfigNameException(format_string(
         'Config object name %name is longer than @max allowed characters',
         array(