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 closed FROM forum_thread where tid=

PHP Debug

No.FileLineCode
1forum.php69require(%s)
2source/module/forum/forum_viewthread.php22showmessage(%s)
3source/function/function_core.php1435dshowmessage(%s, %s, Array, Array, %d)
4source/function/function_message.php240include(%s)
5data/attachment/template/2_5_common_showmessage.tpl.php1hookscriptoutput(%s)
6source/function/function_core.php1226hookscript(%s, %s, %s, Array)
7source/function/function_core.php1186plugin_xiaomy_floor_forum->viewthread_postbottom_output(Array)
8source/plugin/xiaomy_floor/hook.class.php10floor_main()
9source/plugin/xiaomy_floor/function/function_smart.php12discuz_database::fetch_first(%s)
10source/class/discuz/discuz_database.php92discuz_database::query(%s, Array, false, false)
11source/class/discuz/discuz_database.php137db_driver_mysql->query(%s, false, false)
12source/class/db/db_driver_mysql.php154db_driver_mysql->halt(%s, %d, %s)
13source/class/db/db_driver_mysql.php225break()
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