diff --git a/laborious/activities/storage.py b/laborious/activities/storage.py
index d64cc52..7c67466 100644
--- a/laborious/activities/storage.py
+++ b/laborious/activities/storage.py
@@ -202,7 +202,8 @@ class Storage(Postgres, MinioManager):
 
     def close(self) -> None:
         """Close Storage resources (MinIO client and Postgres engine)."""
-        Postgres.close(self)
+        if hasattr(self, 'engine'):
+            Postgres.close(self)
         MinioManager.close(self)
 
     def __del__(self):