WARNING with Top Rating menu

WARNING with Top Rating menu

I get a warning message in the frontend if I select Top Rating menu.

Warning: Parameter 6 to plgJshoppingProductsAddon_label_multiselect::onBeforeQueryGetProductList() expected to be a reference, value given in /home/deb60924/domains/backingtracks.eu/public_html/libraries/joomla/event/event.php on line 71

Here's the link:
http://www.backingtracks.eu/toprating.html

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Aw: WARNING with Top Rating menu

components\com_jshopping\tables\product.php

change
$dispatcher->trigger( 'onBeforeQueryGetProductList', array("top_rating_products", &$adv_result, &$adv_from, &$adv_query, &$order_query, $filters) );

to

$dispatcher->trigger( 'onBeforeQueryGetProductList', array("top_rating_products", &$adv_result, &$adv_from, &$adv_query, &$order_query, &$filters) );

Aw: WARNING with Top Rating menu

That works, thanks!