Hidden Field Javascript Error

Hi,

I have a support page where a user must login in order to post a message.

In my form I have:
[hidden user-login default:user_login]
[hidden user-email default:user_email]

The email is sending perfectly fine but I have an error notice on my backend mail page (additional headers “field”) – Invalid mailbox syntax is used in the Reply-To field.

The Reply-To field: Reply-To: [user-email]

It is a minor plugin error, I am able to reply to the mail send from the user.

Thanks.