Fatal error during admin login

[DrByte]

edit your /includes/functions/sessions.php file.

Around line 157 you'll see this:

  function zen_session_recreate() {
    global $http_domain, $https_domain, $current_domain;
      if ($http_domain == $https_domain) {
      $saveSession = $_SESSION;
      $oldSessID = session_id();
      session_regenerate_id();
      $newSessID = session_id();
      session_id($oldSessID);
      session_id($newSessID);
      if (STORE_SESSIONS == 'db') {
        session_set_save_handler('_sess_open', '_sess_close', '_sess_read', '_sess_write', '_sess_destroy', '_sess_gc');
      }
      session_start();
      $_SESSION = $saveSession;
      whos_online_session_recreate($oldSessID, $newSessID);
    } else {

change it to this:

  function zen_session_recreate() {
    global $http_domain, $https_domain, $current_domain;
      if ($http_domain == $https_domain) {
      $saveSession = $_SESSION;
      $oldSessID = session_id();
      session_regenerate_id();
      $newSessID = session_id();
      session_id($oldSessID);
      session_id($newSessID);
      if (STORE_SESSIONS == 'db') {
        session_set_save_handler('_sess_open', '_sess_close', '_sess_read', '_sess_write', '_sess_destroy', '_sess_gc');
      }
      session_start();
      $_SESSION = $saveSession;
      if (IS_ADMIN_FLAG !== true) {
        whos_online_session_recreate($oldSessID, $newSessID);
      }
    } else {

NOTE: IF THIS HELPS YOU, YOU NEED TO UPGRADE YOUR SITE TO THE CURRENT VERSION !!!!!!!!!!!!