diff --git a/services/clusters-keeper/src/simcore_service_clusters_keeper/utils/clusters.py b/services/clusters-keeper/src/simcore_service_clusters_keeper/utils/clusters.py
index d91a6b3df78..a6ecfdb8189 100644
--- a/services/clusters-keeper/src/simcore_service_clusters_keeper/utils/clusters.py
+++ b/services/clusters-keeper/src/simcore_service_clusters_keeper/utils/clusters.py
@@ -83,7 +83,7 @@ def _convert_to_env_dict(entries: dict[str, Any]) -> str:
 
     return [
         f"CLUSTERS_KEEPER_EC2_ACCESS_KEY_ID={app_settings.CLUSTERS_KEEPER_EC2_ACCESS.EC2_ACCESS_KEY_ID}",
-        f"CLUSTERS_KEEPER_EC2_ENDPOINT={app_settings.CLUSTERS_KEEPER_EC2_ACCESS.EC2_ENDPOINT}",
+        f"CLUSTERS_KEEPER_EC2_ENDPOINT={app_settings.CLUSTERS_KEEPER_EC2_ACCESS.EC2_ENDPOINT or 'null'}",
         f"CLUSTERS_KEEPER_EC2_REGION_NAME={app_settings.CLUSTERS_KEEPER_EC2_ACCESS.EC2_REGION_NAME}",
         f"CLUSTERS_KEEPER_EC2_SECRET_ACCESS_KEY={app_settings.CLUSTERS_KEEPER_EC2_ACCESS.EC2_SECRET_ACCESS_KEY}",
         f"DASK_NTHREADS={app_settings.CLUSTERS_KEEPER_DASK_NTHREADS or ''}",