fep_shortcode_new_message_form TO input glitch

I discovered a glitch in the fep_shortcode_new_message_form shortcode when using the TO variable to set a specific user id. I always got an invalid recipient message.

I tracked down the bug and have fixed it.
edit file: includes/class-fep-form.php
line 451

change this:
$to = $_POST['message_to_id'] = fep_get_userdata( $preTo ); //return ID;

to this:
$to = $_POST['message_to_id'] = fep_get_userdata( $preTo, 'ID', 'id' ); //return ID;