/wp-comments-post.php 409 (Conflict)

Hello
great plugin, but i have one issue when submiting same comment, it works (modal ok) but in console i have always that error (this is from your demo site, i have the same error)

https://wpdemo.weweave.net/wp-comments-post.php 409 (Conflict)

Do you have an idea, to try to avoid this error.

Thanks

https://www.ads-software.com/plugins/wp-ajaxify-comments/