Undefined index: authenticated user in _autologout_check_one_session on row 544

Error message on my system affected function _autologout_check_one_session on row 544.

There is a behaviour about submitting page:

admin/config/people/autologout

My site has english as default language and italian as second one. If I access module's configuration panel from italian lang:

it/admin/config/people/autologout

variable autologout_one_session is registered in database this way:

a:4:{s:18:"utente autenticato";s:1:"0";s:13:"administrator";s:1:"0";s:9:"role2";s:1:"0";s:11:"role3";s:1:"0";}

But if I access module's configuration panel from english lang:

en/admin/config/people/autologout

variable autologout_one_session is registered in database this way:

a:4:{s:18:"authenticated user";s:1:"0";s:13:"administrator";s:1:"0";s:9:"role2";s:1:"0";s:11:"role3";s:1:"0";}

In file autologout.module row 543-545 I see:

  foreach ($user->roles as $role) {
    $return = $return && $values[t($role)];
  }

t() function translates user's role and this creates problems when variables contains role name translated in a language different from language selected by user.

MY TEMPORARY SOLUTION:
I had to access module's configuration panel from english lang and then submit, then I change module's code omitting translation function t() this way:

  foreach ($user->roles as $role) {
    $return = $return && $values[$role];
  }

But I think this a bug: module should always save autologout_one_session variable in english and omit t() function inside the code.

What do you think about?

Anyway this is a great module, thank you.