Discuz! Database 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 1
select fid from forum_thread where tid=3345=

PHP Debug

No.FileLineCode
1forum.php63runhooks()
2source/function/function_core.php1134hookscript()
3source/function/function_core.php1181plugin_ljsubject_forum->viewthread_title_extra()
4source/plugin/ljsubject/ljsubject.class.php34discuz_database::result_first()
5source/class/discuz/discuz_database.php123discuz_database::query()
6source/class/discuz/discuz_database.php142db_driver_mysqli->query()
7source/class/db/db_driver_mysqli.php148db_driver_mysqli->halt()
8source/class/db/db_driver_mysqli.php223break()
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