foreach ($this->arrProductKeys as $insert_key) {
                $value = $objFormParam->getValue($insert_key);
                $arrAddProducts[$insert_key]   = (is_array($value))? $value: array();
// added
        $product_class_id = $objFormParam->getValue('add_product_class_id');
        if (SC_Utils_Ex::isBlank($product_class_id)) {
                $arrWorkProducts = array();
                $cnt = 0;
                foreach ($arrAddProducts[$insert_key] as $data) {
                    $arrWorkProducts[] = $data;
                    if ($cnt == $objFormParam->getValue('no')) {
                        $arrWorkProducts[] = $arrAddProductInfo[$insert_key];
                    }
                    $cnt++;
                }
                $arrAddProducts[$insert_key] = $arrWorkProducts;
        } else {
// added
                $arrAddProducts[$insert_key][] = $arrAddProductInfo[$insert_key];
// added
        }
// added
            }