diff --git a/src/Api/Serializer/BasicIPInfoSerializer.php b/src/Api/Serializer/BasicIPInfoSerializer.php
index 6a02e64..f2753a6 100644
--- a/src/Api/Serializer/BasicIPInfoSerializer.php
+++ b/src/Api/Serializer/BasicIPInfoSerializer.php
@@ -44,6 +44,6 @@ protected function getDefaultAttributes($ip): array
      */
     public function getId($model)
     {
-        return hash('sha256', $model->address);
+        return hash('sha256', (string)$model->address);
     }
 }