Error with Multiple userDB

Authentication module is SAML v2 UserDB module is Multi => LDAP;Null

When userDB succeed on LDAP it's Ok, but when it fails there is an infinite loop between SP and IDP :

[warn] No SP found in configuration [warn] Lemonldap::NG : john.doe@bull.net was not found in LDAP directory (192.168.37.1) [error] SSO request or response was not found [warn] No SP found in configuration [warn] Lemonldap::NG : john.doe@bull.net was not found in LDAP directory (192.168.37.1) [error] SSO request or response was not found [warn] No SP found in configuration [warn] Lemonldap::NG : john.doe@bull.net was not found in LDAP directory (192.168.37.1) [error] SSO request or response was not found ...

There is a temporary solution to avoid this error : patch AuthSAML.pm, line 358 :

            # This should not happen
            $self->lmLog( "SSO request or response was not found", 'error' );

+            return PE_OK;
+ 
            # Redirect user
            $self->{mustRedirect} = 1;
            return $self->_subProcess(qw(autoRedirect));