Last visit problem

[Honda1733]

Hi, I installed the last visit contrib 1.2.8 and I have a error message:

 

SQL Error : 1064 You have an error in your SQL syntax. Check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 4

 

SELECT u.*, s.* FROM phpbb_sessions s, phpbb_users u WHERE s.session_id = '' AND u.user_id = s.session_user_id AND session_time >

 

Line : 241

File : /data/members/paid/a/q/aquarecifal.com/htdocs/www/includes/sessions.php

 

I need help...