SAVE Notice: Undefined index: saving

I'm having a problem.
I've contacted the all the related mod developers and theme developer but all are either not replying / not helping...
I'm using an extension which help to display the discount percentage for Specials product by webvet (free extension).

The percentage display just fine in homepage, category and product page.
But when tried with the product filter that I have, it display the following error:

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%

You can see it on http://jefferson.com.my/test/index.php? ... rProduct=1

I've tried clearing vqmod cache, try look into the file but I have no idea what went wrong, anyone can help me with this?

Additionally, I'm also looking for a better Product Filter extension that works with this mod:
http://www.opencart.com/index.php?route ... n_id=14468

Please let me know if you can help, I can pay for your trouble, and I need it really fast.

Contribution error issue. Contact the author of the extension to resolve this issue.

3 days passed and the Product Filter author is not giving any reply.
So I'm seeking help here.