diff --git a/Civi/Mailinglistsync/QueueHelper.php b/Civi/Mailinglistsync/QueueHelper.php
index 036ee2a..3f250b5 100644
--- a/Civi/Mailinglistsync/QueueHelper.php
+++ b/Civi/Mailinglistsync/QueueHelper.php
@@ -106,14 +106,12 @@ class QueueHelper {
    * Stores an email address in the queue helper singleton.
    *
    * @param \CRM_Queue_TaskContext $context
-   * @param string|null $email
+   * @param string $email
    *
    * @return bool
    */
-  public static function storeEmail(\CRM_Queue_TaskContext $context, ?string $email): bool {
-    if (!empty($email)) {
-      self::getInstance()->addToEmails($email);
-    }
+  public static function storeEmail(\CRM_Queue_TaskContext $context, string $email): bool {
+    self::getInstance()->addToEmails($email);
     return TRUE;
   }