Invalid argument in foreach in uc_cart.module on line 1614 on /uc_ajax_cart/update

I see this error in my logs once in a while, and you can see it on other sites by googling "uc_cart.module on line 1614." I can reproduce the error by visiting /uc_ajax_cart/update with nothing in the cart. It's probably triggered by search crawlers, but I suggest adding a condition for $_POST on line 113 un uc_ajax_cart.module:

    case 'update':
	if($_POST) {
		$formValues = array('values' => $_POST);
		$cart = new UcAjaxCart();
		$items = $cart->getCartContents();
		drupal_execute('uc_cart_view_form', $formValues, $items);
		print theme('status_messages');
	}
    break;