Error in query of chart about number of users per role

Hi,
This doesn't seems to be serious bug.
In the system chart submodule there is error in the query that will fetch the data that will display the number or users in particular role.

System_charts.module

case:users_per_role
$query = db_select('users_roles', 'ur');
      $query->join('users', 'u', 'ur.uid = u.uid');
      $query->join('role', 'r', 'r.rid = ur.uid');
      $query->fields('r', array('rid', 'name'));
      $query->addExpression('COUNT(*)', 'count');
      $query->groupBy('r.rid');
      $query->orderBy('r.name');

Above query only shows one user per role. I think this should be like this.

case:users_per_role
$query = db_select('users_roles', 'ur');
    	$query->join('role','r', 'r.rid = ur.rid');
    	$query->fields('r', array('rid', 'name'));
    	$query->groupBy('r.name');
    	$query->addExpression('COUNT(ur.uid)', 'count');