Discuz! info: MySQL Query Error

Time: 2009-1-6 8:06pm
Script: /forum/index.php

SQL: SELECT uid, username, groupid, invisible, action, lastactivity, fid FROM cdb_sessions ORDER BY uid DESC
Error: Record has changed since last read in table 'cdb_sessions'
Errno.: 1020

Similar error report has beed dispatched to administrator before.