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 'and tid=795' at line 1
SELECT count(*) FROM forum_post where authorid= and tid=795

PHP Debug

No.FileLineCode
1forum.php67require(%s)
2source/module/forum/forum_forumdisplay.php974include(%s)
3data/template/3_diy_forum_forumdisplay.tpl.php1hookscriptoutput(%s)
4source/function/function_core.php1214hookscript(%s, %s)
5source/function/function_core.php1177call_user_func(Array, Array)
6plugin_ljhuitie->global_footerlink(Array)
7source/plugin/ljhuitie/huitie.class.php72discuz_database::result_first(%s)
8source/class/discuz/discuz_database.php120discuz_database::query(%s, Array, false, false)
9source/class/discuz/discuz_database.php139db_driver_mysql->query(%s, false, false)
10source/class/db/db_driver_mysql.php152db_driver_mysql->halt(%s, %d, %s)
11source/class/db/db_driver_mysql.php223break()
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