Opencart - Notice: Undefined index: saving in

I'm using Opencart 1.5.6.1.

In this page: http://jefferson.com.my/test/index.php?route=product/results&category=[75]&path=0&filterProduct=1

There's error in some products, SAVE Notice: Undefined index: saving in /home/jefferso/public_html/test/vqmod/vqcache/vq2-catalog_view_theme_pav_fashion_template_product_category.tpl on line 147%

It's because I install a mod that display the discounted percentage. It doesn't have problem displaying in category page, product page and home page, but if you try the filter on the left (tick T-shirt) which resulted in the page above, the error will show out.

I don't know how to deal with that cache file, and the theme developer doesn't want to help at all.

Solution

Go to your source > vqmod > xml > & then find & open "webvet_percentage_to_specials_v6.xml" file > & then below code add in bottom of the page above </modification> tag. > & then check it.

// FILTER PAGE
<file name="catalog/controller/product/results.php">

    <operation>
        <search position="after"><![CDATA[
        'special'     => $special,
        ]]></search>

        <add><![CDATA[
        'saving'     => round((($result['price'] - $result['special'])/$result['price'])*100, 0),
        ]]></add>
    </operation>
</file>

<file name="catalog/view/theme/*/template/product/result.tpl">

    <operation>
        <search position="after"><![CDATA[
        <span class="price-old"><?php echo $product['price']; ?></span> <span class="price-new"><?php echo $product['special']; ?></span>
        ]]></search>

        <add><![CDATA[
        <br /><span style="color: red;">SAVE <?php echo $product['saving']; ?>%</span>
        ]]></add>
    </operation>
</file>