diff --git a/Service/TpayAliasService.php b/Service/TpayAliasService.php
index d6d2adb..01d47d2 100644
--- a/Service/TpayAliasService.php
+++ b/Service/TpayAliasService.php
@@ -39,7 +39,7 @@ public function getCustomerAlias(int $customerId)
             ->from($tableName)
             ->where('cli_id = ?', $customerId);
 
-        return $connection->fetchRow($select)['alias'];
+        return $connection->fetchRow($select)['alias'] ?? null;
     }
 
     public function saveCustomerAlias(int $customerId, string $alias): void