Hello.
I have the same problem with the plugin. The error comes from the base/free version. When it goes through the product detail view, the plugin does not check if it is a $product variable is not false and tries count(false) or tries to false->get_children().
I have contacted them, but they “wash their hands” of the problem and say it’s Enfold theme because it doesn’t happen with Storefront.
It’s a PHP problem, of course.
I have the purchased version of this plugin and I would like to use it as my website is in Enfold. I will try to update the information to see if they can fix it.