PDOException when watchdog is empty

 PDOException: SQLSTATE[42000]: Syntax error or access violation: 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 ')) ) subquery' at line 2: SELECT COUNT(*) AS expression FROM (SELECT 1 AS expression FROM {watchdog} w LEFT OUTER JOIN {users} u ON w.uid = u.uid WHERE (()) ) subquery; Array ( [0] => page not found ) in PagerDefault->execute() (line 74 of /www/htdocs/includes/pager.inc).