diff --git a/core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php b/core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php
index 90e9496..8017143 100644
--- a/core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php
+++ b/core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php
@@ -68,8 +68,7 @@ public function setOriginalID($id) {
    * configuration entity is unique.
    */
   public function isNew() {
-    // Configuration entity IDs are strings, and '0' is a valid ID.
-    return !empty($this->enforceIsNew) || $this->id() === NULL || $this->id() === '';
+    return !empty($this->enforceIsNew);
   }
 
   /**