But something just happen that maybe not expected by the developer. I set my site to offline to test some configuration. And when I tried to login (from frontend), the error message appears.
"ReCAPTCHA Text Error"
Whereas no reCapthca form there. So I had to disable this plugin that time.
You have right, we didnt expect to that situation
Offline front login is also a login form and part of com_user
We will add recaptcha form to offline login and I expect any other sugestion on our forum.
Lot of thanks for all reviews!