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Hi,
it’s a strange issue. You can try this:
open file class.yith-woocompare-frontend.php in yith-woocommerce-compare/includes and comment line 432

Let me know if it works. Regards ??

There is nothing in line 432. Here is the code from 427 to 433:

else {

                $template_path = get_template_directory() . '/' . $woocommerce->template_url . $this->template_file;

                $child_path    = get_stylesheet_directory() . '/' . $woocommerce->template_url . $this->template_file;

            }

Hi,
because of line separator you have blank space between two code line, so you found nothing in line 432.
Try to search in file class.yith-woocompare-frontend.php this code check_ajax_referer( $this->action_add, '_yitnonce_ajax' ) and comment it.

Let me know, regards.