My account, your return request

Hi everyone, i realize there's a bug in the return request section. try return a product first. Next click on my account->your return request. you will realize your customer name is showing duplicate firstname. it should be firstname and lastname. i found the issue in catalog->controller->account->return.php.

On line 72

'name' => $result['firstname'] . ' ' . $result['lastname'],

(i try taking off the $result lastname and the customer name indeed show only the firstname. So i assume the fault is something related to here.)

However the code seems to be fine but i have no idea why is it showing duplicate firstname. any one knows how to solve this?