What version is this? I've just tried it in the latest v2.2.0-9 and it's working fine. If you're already on the v2.2.x, simply click Settings -- System Update (please make sure to back up your database & files first)
Attached is the screenshot of the contacts page with captcha.
i used 2.1.2-3, after trying to do the update, an other error occured:
DB Error - Could not run query: UPDATE gk_user_sessions SET date_last_seen = '2019-09-14 12:11:01' WHERE session_string = 'sdpviev47r3c6b5vu4eologs80' AND user_id = '1' AND ip_address = '188.8.131.52' Error:Unknown column 'date_last_seen' in 'field list'