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.php71require(%s)
2source/module/forum/forum_viewthread.php25showmessage(%s)
3source/function/function_core.php1416dshowmessage(%s, %s, Array, Array, %d)
4source/function/function_message.php239include(%s)
5data/template/2_2_common_showmessage.tpl.php1hookscriptoutput(%s)
6source/function/function_core.php1207hookscript(%s, %s, %s, Array)
7source/function/function_core.php1167plugin_it618_attachdisplay_forum->viewthread_posttop_output(Array)
8source/plugin/it618_attachdisplay/attachdisplay.class.php21discuz_database::result_first(%s)
9source/class/discuz/discuz_database.php117discuz_database::query(%s, Array, false, false)
10source/class/discuz/discuz_database.php136db_driver_mysql->query(%s, false, false)
11source/class/db/db_driver_mysql.php153db_driver_mysql->halt(%s, %d, %s)
12source/class/db/db_driver_mysql.php224break()
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