Bug in Marketpress & MP 2.8 Beta

We found a Bug in Marketpress.

marketpress.php main plugin file (if order is total is 0) then marketpress automatically uses manual payment but there is a bug on line 3168 and 3169
currently lines are:
$payment_info['method'][] = __('N/A - Free order', 'mp');
$payment_info['transaction_id'][] = __('N/A', 'mp');
they should be:
$payment_info['method'] = __('N/A - Free order', 'mp');
$payment_info['transaction_id'] = __('N/A', 'mp');

this is in version 2.8 beta 2

in version 2.7 lines 2952 and 2953 have the same issue

Please Fix it. Thank you