diff --git a/odoo/addons/test_new_api/tests/test_new_fields.py b/odoo/addons/test_new_api/tests/test_new_fields.py
index 027209ed0b9..9af27961535 100644
--- a/odoo/addons/test_new_api/tests/test_new_fields.py
+++ b/odoo/addons/test_new_api/tests/test_new_fields.py
@@ -1672,6 +1672,9 @@ class TestFields(TransactionCaseWithUserDemo):
         with self.assertRaises(MissingError):
             deleted.categories
 
+        # special case: should not fail
+        Discussion.browse([None]).read(['categories'])
+
     def test_40_real_vs_new(self):
         """ test field access on new records vs real records. """
         Model = self.env['test_new_api.category']
diff --git a/odoo/models.py b/odoo/models.py
index 691e3e86ad4..da85cd0a76e 100644
--- a/odoo/models.py
+++ b/odoo/models.py
@@ -3231,7 +3231,7 @@ class BaseModel(metaclass=MetaModel):
                 self = self.exists()
                 self.check_access_rule('read')
 
-            result = [(id_,) for id_ in self._ids]
+            result = [(id_,) for id_ in self.ids]
 
         fetched = self.browse()
         if result: