/fr/top-referrers.html
  (8) Undefined index: lang   SiteListModel.php   line 224     24-7-17   9:11
FrontController->dispatch() # line   17, file: /var/www/netref.info/index.php
  call_user_func_array(Array[2], Array[0]) # line  220, file: /var/www/netref.info/core/FrontController.php
    SiteController->topReferrersAction() # line    0, file: unknown
      SiteListModel->getValidatedTopReferrersSites() # line  317, file: /var/www/netref.info/controllers/SiteController.php