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.php67require(%s)
2source/module/forum/forum_viewthread.php27showmessage(%s)
3source/function/function_core.php1429dshowmessage(%s, %s, Array, Array, %d)
4source/function/function_message.php237include(%s)
5data/template/6_6_common_showmessage.tpl.php1hookscriptoutput(%s)
6source/function/function_core.php1221hookscript(%s, %s, %s, Array)
7source/function/function_core.php1180call_user_func(Array, Array)
8plugin_it618_postdisplay_forum->viewthread_posttop_output(Array)
9source/plugin/it618_postdisplay/postdisplay.class.php59discuz_database::result_first(%s)
10source/class/discuz/discuz_database.php123discuz_database::query(%s, Array, false, false)
11source/class/discuz/discuz_database.php142db_driver_mysql->query(%s, false, false)
12source/class/db/db_driver_mysql.php152db_driver_mysql->halt(%s, %d, %s)
13source/class/db/db_driver_mysql.php223break()
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