diff --git a/src/common/tools/object_factory/Slice.py b/src/common/tools/object_factory/Slice.py
index 6ab666aa6ed379eb0b8948b1178aa13069d70bf4..970b12ad9e41882319d6d3dfdbaa052a6ce92909 100644
--- a/src/common/tools/object_factory/Slice.py
+++ b/src/common/tools/object_factory/Slice.py
@@ -14,7 +14,9 @@
 
 import copy
 from typing import Dict, List, Optional
+from common.Constants import DEFAULT_CONTEXT_NAME
 from common.proto.context_pb2 import SliceStatusEnum
+from common.tools.object_factory.Context import json_context_id
 
 def get_slice_uuid(a_endpoint_id : Dict, z_endpoint_id : Dict) -> str:
     return 'slc:{:s}/{:s}=={:s}/{:s}'.format(
@@ -35,6 +37,8 @@ def json_slice(
     constraints : List[Dict] = [], config_rules : List[Dict] = [], service_ids : List[Dict] = [],
     subslice_ids : List[Dict] = [], owner : Optional[Dict] = None):
 
+    if context_id is None: context_id = json_context_id(DEFAULT_CONTEXT_NAME)
+
     result = {
         'slice_id'          : json_slice_id(slice_uuid, context_id=context_id),
         'slice_status'      : {'slice_status': status},