diff --git a/openerp/addons/base/res/res_bank.py b/openerp/addons/base/res/res_bank.py
index 00d18d08078..aa9fa861548 100644
--- a/openerp/addons/base/res/res_bank.py
+++ b/openerp/addons/base/res/res_bank.py
@@ -190,6 +190,7 @@ class res_partner_bank(osv.osv):
                 try:
                     if not data.get('bank_name'):
                         data['bank_name'] = _('BANK')
+                    data = dict((k, v or '') for (k, v) in data.iteritems())
                     name = bank_code_format[data['state']] % data
                 except Exception:
                     raise osv.except_osv(_("Formating Error"), _("Invalid Bank Account Type Name format."))