Strict warning error on checkout

When I checkout with ubercart, I receive this error:

Strict warning: Only variables should be passed by reference in uc_payment_form_uc_cart_checkout_review_form_alter() (line 144 of *****\sites\all\modules\contrib\ubercart\payment\uc_payment\uc_payment.module).

It can be fixed by changing in uc_payment.module line 144 from

$form['#suffix'] = drupal_render(drupal_get_form($redirect, $order));

to

    $suffix = drupal_get_form($redirect, $order);
    $form['#suffix'] = drupal_render($suffix);