diff --git a/core/lib/Drupal/Core/Entity/Plugin/DataType/EmailItem.php b/core/lib/Drupal/Core/Entity/Plugin/DataType/EmailItem.php
index b147976..3732b73 100644
--- a/core/lib/Drupal/Core/Entity/Plugin/DataType/EmailItem.php
+++ b/core/lib/Drupal/Core/Entity/Plugin/DataType/EmailItem.php
@@ -52,6 +52,6 @@ public function getPropertyDefinitions() {
    * {@inheritdoc}
    */
   public function isEmpty() {
-    return !isset($this->values['value']) || $this->values['value'] === '';
+    return $this->value === NULL || $this->value === '';
   }
 }