diff --git a/trytond/osv/orm.py b/trytond/osv/orm.py
index caec08210a..fbff9f8d23 100644
--- a/trytond/osv/orm.py
+++ b/trytond/osv/orm.py
@@ -102,9 +102,9 @@ class BrowseRecord(object):
             # create browse records for 'remote' objects
             for data in datas:
                 for i, j in ffields:
-                    obj = self._table.pool.get(j._obj)
-                    if not obj:
+                    if not j._obj in self._table.pool.object_name_list():
                         continue
+                    obj = self._table.pool.get(j._obj)
                     if j._type in ('many2one',):
                         if not j._classic_write and data[i]:
                             if isinstance(data[i][0], (list, tuple)):
diff --git a/trytond/osv/osv.py b/trytond/osv/osv.py
index 03314fecab..d717ab5f41 100644
--- a/trytond/osv/osv.py
+++ b/trytond/osv/osv.py
@@ -155,7 +155,7 @@ class OSV(ORM):
         try to apply inheritancy at the instanciation level and
         put objs in the pool var
         """
-        if pool.get(cls._name):
+        if cls._name in pool.object_name_list():
             parent_class = pool.get(cls._name).__class__
             cls = type(cls._name, (cls, parent_class), {})