Not working on Strapi v3.6.8

Hey, thank you for the plugin, I really appreciate the idea, but when i tried it on my strapi instance it fails in the way you can see in the screenshot below when adding/saving an entry (of a content type):

<img width="828" alt="Screenshot 2021-08-27 at 14 51 46" src="https://user-images.githubusercontent.com/1221092/131130568-1ade3270-3de9-4f72-87e1-0ea893c65e90.png">

Any hint?
Thanks.