In the WA_eCart/checkoutScripts/Protx_VSPForm.php file, edit lines 133 - 137:
if ($theCart->RuleLooperValue($tempParam) > 0) {
$theBasket .= ":".$theCart->RuleLooperName($tempParam).":::::".WA_eCart_DisplayMoney($theCart, $theCart->RuleLooperValue($tempParam));
$theCart->MoveNext();
$basketCount++;
}
to:
if ($theCart->RuleLooperValue($tempParam) > 0) {
$theBasket .= ":".$theCart->RuleLooperName($tempParam).":::::".WA_eCart_DisplayMoney($theCart, $theCart->RuleLooperValue($tempParam));
$theCart->MoveNext();
$basketCount++;
} else {
$theBasket .= ":".$theCart->RuleLooperName($tempParam).":::::0");
$theCart->MoveNext();
$basketCount++;
}