diff --git a/src/linkahead/common/models.py b/src/linkahead/common/models.py
index a3b4683a20a49fe1fc936d47fb185823c4e0eaba..69ac403b8354f8d0690eaf35583dab060122efdf 100644
--- a/src/linkahead/common/models.py
+++ b/src/linkahead/common/models.py
@@ -3824,6 +3824,8 @@ class Container(list):
                             is_being_referenced.add(prop.value)
                         elif is_list_datatype(prop_dt):
                             for list_item in prop.value:
+                                if list_item is None:
+                                    continue
                                 if isinstance(list_item, int):
                                     is_being_referenced.add(list_item)
                                 else: