Some product images are not showing in the search results page

Hi,

I’ve just installed Woocommerce Predictive Search Lite (2.1.8) and almost everything is working great. But some of the product images are not showing in the search box and in the search results page. The products in my shop are variable products, and I’ve checked that all of them have a picture for the default variation.

By the way, I’m using WooCommerce 2.0.12.

https://www.ads-software.com/extend/plugins/woocommerce-predictive-search/