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 authorid FROM forum_thread WHERE tid=

PHP Debug

No.FileLineCode
1forum.php63runhooks()
2source/function/function_core.php1134hookscript()
3source/function/function_core.php1181plugin_it618_linemap_forum->viewthread_postheader()
4source/plugin/it618_linemap/linemap.class.php118discuz_database::result_first()
5source/class/discuz/discuz_database.php123discuz_database::query()
6source/class/discuz/discuz_database.php142db_driver_mysql->query()
7source/class/db/db_driver_mysql.php152db_driver_mysql->halt()
8source/class/db/db_driver_mysql.php223break()
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