Seahorse shows keyring with no name

Binary package hint: seahorse

Hello
I have Ubuntu 10.04 and in seahorse, i have one item with no name for each time system tried to create a password in defaut keyring.
I cannnot delete this keyrings and cannot change passsword

When I launch seahorse in terminal I have the following message for each item :

(seahorse:3247): Gtk-WARNING **: Failed to set text from markup due to error parsing markup: Erreur à la ligne 1, caractère 58 : Texte codé en UTF-8 non valide dans le nom - «  par_d\xffffffc3\xffffffa9faut » est non valide

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: seahorse 2.30.0-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-21-generic i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Mon Apr 26 20:32:28 2010
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Release Candidate i386 (20100419.1)
ProcEnviron:
 LANG=fr_FR.utf8
 SHELL=/bin/bash
SourcePackage: seahorse