Problema con contrib Who's Online Enhancement 1.7.1

[riga75]

Quando clicco su Chi è online mi da questo errore:

1054 - Unknown column 'user_agent' in 'field list'

select customer_id, full_name, ip_address, time_entry, time_last_click, last_page_url, http_referer, user_agent, session_id from whos_online order by time_last_click DESC

Cosa devo fare?

Grazie mille