Error messages in the settings

In the “Rating label” field I got this per default:

<br /><b>Notice</b>: Trying to access array offset on value of type bool in <b>/var/www/clients/client237/web110/web/wp-content/plugins/wp-post-comment-rating/admin/partials/wp-post-comment-rating-admin-display.php</b> on line <b>75</b><br />

The dropdown below is full of error messages too. I just installed it, nothing configurated or anything. Searching for an alternative by now.