diff --git a/base_sparse_field_list_support/models/fields.py b/base_sparse_field_list_support/models/fields.py
index 8b453977d..876b5a1e0 100644
--- a/base_sparse_field_list_support/models/fields.py
+++ b/base_sparse_field_list_support/models/fields.py
@@ -9,7 +9,7 @@ from odoo import fields
 
 def convert_to_cache(self, value, record, validate=True):
     # cache format: dict / list
-    if value is False:
+    if value is False or value is None:
         value = {}
     return value if isinstance(value, (dict, list)) else json.loads(value)