Notice: Undefined property: stdClass::$data in restrict_ip_boot()

In hook_boot() in line number 230 and 238, the user object is supposed to have data index.
$country_code = $user->data['country_iso_code_2'];
But this 'country_iso_code_2' is set from some other module 'ip2country'. So, this module needs a dependency of 'ip2country'. And for anonymous user, user object doesn't have 'country_iso_code_2' value. So, in that case country code needs to be calculated from the given ip address.