diff --git a/pycti/utils/opencti_stix2.py b/pycti/utils/opencti_stix2.py
index f7f4513fa..9dda7f068 100644
--- a/pycti/utils/opencti_stix2.py
+++ b/pycti/utils/opencti_stix2.py
@@ -308,7 +308,7 @@ def extract_embedded_relationships(
         object_marking_ids = (
             stix_object["object_marking_refs"]
             if "object_marking_refs" in stix_object
-            else []
+            else None
         )
 
         # Open vocabularies