Script error

Hello,

In am having an error during loading my webpage. Console view shows an Uncaugh Reference Error in script:

<script>
                WAPF.Filter.add('wapf/pricing/base',function(price, data) {
                    if(data.parent.find('.price-rule-active').length)
                        return data.parent.find('.price-rule-active').data('price-rules-price');
                    return price;
                });
</script>

May somebody help with this issue?
Webpage: https://adeoliva.com/