diff --git a/trytond/model/modelsql.py b/trytond/model/modelsql.py
index 2f46d2422c..6303dc1be5 100644
--- a/trytond/model/modelsql.py
+++ b/trytond/model/modelsql.py
@@ -619,7 +619,7 @@ class ModelSQL(ModelStorage):
                 if hasattr(cls._fields[field], 'datetime_field') \
                         and cls._fields[field].datetime_field:
                     for record in res:
-                        if not record[field]:
+                        if record[field] is None:
                             continue
                         with Transaction().set_context(_datetime=record[
                                     cls._fields[field].datetime_field]):