Hello,

I build an install profile to create sub-domains sites in a few clicks. I integrate the singlesignon module on the main site, and use it on each sub-site. The singlesignon client module is enabled during the profile installation, but I see this error after enabling it :

Notice: Undefined property: stdClass::$global_sid in sites/all/modules/contrib/sso/client/singlesignon_client.module on line 47.

If I see the line 47 of the module, this is the code : 

    // Prevent creation of sticky local sessions.
    if (!isset($user->global_sid) && ($user->global_sid != '')) {
      session_save_session(FALSE);
    }

But I don't understand clearly the goal of this code... this test is never executed :

1. be sure $user->global_sid isn't set
2. AND same value isn't empty.

If the variable isn't set, he can't be not empty... If anyone can explain the goal of this little code, and in which case the test can be passed because I don't see...

Thanks in advance.