remove function in frontend contollers

It seems that there is a bug in the remove fucntion in the frontend controllers in the line

//Checking if the user can remove object
$user = JFactory::getUser();
if ($user->authorise($user->authorise('core.delete', 'com_indepit'))) {

$user->authorise occurs 2 times and the result is an error 500.

if ($user->authorise('core.delete', 'com_indepit')) { works !

thanks