[Plugin: WP Captcha-Free] Problem when responding on comments in the backend

Hello,

I like the plugin, it really reduced spam to zero for me! 🙂
But when I want to write an answer to a comment via the “Respond” button in the backend, it doesn’t work because the plugin requires the hash.

Can you change that somehow? (Or is this an error on my part?)

http://ww.wp.xz.cn/extend/plugins/wp-captcha-free/