diff --git a/openerp/addons/base/res/res_currency.py b/openerp/addons/base/res/res_currency.py
index 931666f3d7f..0a50631f50b 100644
--- a/openerp/addons/base/res/res_currency.py
+++ b/openerp/addons/base/res/res_currency.py
@@ -56,9 +56,9 @@ class res_currency(osv.osv):
             if cr.rowcount:
                 res[id] = cr.fetchone()[0]
             elif not raise_on_no_rate:
-                res[currency.id] = 0
+                res[id] = 0
             else:
-                raise osv.except_osv(_('Error!'),_("No currency rate associated for currency '%s' for the given period" % (currency.name)))
+                raise osv.except_osv(_('Error!'),_("No currency rate associated for currency '%d' for the given period" % (id)))
         return res
 
     _name = "res.currency"