diff --git a/src/Service/PsOrderService.php b/src/Service/PsOrderService.php
index dba1cab3..b5f43d0f 100644
--- a/src/Service/PsOrderService.php
+++ b/src/Service/PsOrderService.php
@@ -131,6 +131,6 @@ private function getOrderId($orderOrId): string
             return (string) $orderOrId->id;
         }
 
-        return $orderOrId;
+        return (string) $orderOrId;
     }
 }