PHP Notice: Undefined variable: cookie_value

-- HikaShop version -- : 4.2.2
-- Joomla version -- : 3.9.15
-- PHP version -- : 7.3.6

Hey,

When contacting the webhost on another issue, they also noticed this issue in the error_log.
Although they don't believe it's releated to that other issue they wanted to let me know.

The issue is:
PHP Notice: Undefined variable: cookie_value in /home/public/sites/www.blahblah.com/components/com_hikashop/views/product/tmpl/listing_div.php on line 89, referer: HT TP://blahblah.com/
(I put a space there to not get an url)

Maybe you know what this means and how to solve it.

Thank you.
Wim