diff --git a/pdsl_ldap_membership/ldap_membership.py b/pdsl_ldap_membership/ldap_membership.py
index 26fbc7d31b034831215e16a3c101ecefc51a1088..492564823cff0f1f935dc4a59df0d297c4cc2003 100644
--- a/pdsl_ldap_membership/ldap_membership.py
+++ b/pdsl_ldap_membership/ldap_membership.py
@@ -302,7 +302,8 @@ class ResPartner(models.Model):
             # TODO Pick the date only if PAID. Otherwise, pick Date_From + 60 jours.
             end_dates = [time.mktime(time.strptime(line.date_to, '%Y-%m-%d'))
                          for line in self.member_lines
-                         if line.state in ACTIVE_STATES]
+                         if line.state in ACTIVE_STATES
+                         if line.date_to]
             if end_dates:
                 expire_date = max(end_dates)