Discuz! Database Error

(1054) Unknown column 'NaN' in 'where clause'
SELECT cd_addtime FROM music_song WHERE cd_singer=NaN order by cd_addtime desc

PHP Debug

No.FileLineCode
1plugin.php49include(%s)
2source/plugin/music/singer.inc.php79include_once(%s)
3data/template/20_music_singer.tpl.php39discuz_database::query(%s, Array)
4source/class/discuz/discuz_database.php137db_driver_mysqli->query(%s, false, false)
5source/class/db/db_driver_mysqli.php147db_driver_mysqli->halt(%s, %d, %s)
6source/class/db/db_driver_mysqli.php222break()
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