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.php65runhooks()
2source/function/function_core.php1124hookscript(%s, %s, %s, Array, %s, %s)
3source/function/function_core.php1171plugin_it618_linemap_forum->viewthread_postheader(Array)
4source/plugin/it618_linemap/linemap.class.php105discuz_database::result_first(%s)
5source/class/discuz/discuz_database.php117discuz_database::query(%s, Array, false, false)
6source/class/discuz/discuz_database.php136db_driver_mysql->query(%s, false, false)
7source/class/db/db_driver_mysql.php153db_driver_mysql->halt(%s, %d, %s)
8source/class/db/db_driver_mysql.php224break()
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