打开内容链接链接错误，刷新下又可以正常访问了，求解决

内容页打开时不时就这样，刷新下又可以正常访问了，求解决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 1SELECT COUNT(*) FROM forum_post where authorid=

PHP Debug

No.	File	Line	Code
1	forum.php	58	require(%s)
2	source/module/forum/forum_viewthread.php	873	include(%s)
3	data/template/2_diy_forum_viewthread.tpl.php	1	hookscriptoutput()
4	source/function/function_core.php	1147	hookscript()
5	source/function/function_core.php	1115	plugin_iplus_userclear_forum->viewthread_sidebottom_output(Array)
6	source/plugin/iplus_userclear/hook.class.php	38	plugin_iplus_userclear->userCount(%s)
7	source/plugin/iplus_userclear/hook.class.php	8	discuz_database::result_first(%s)
8	source/class/discuz/discuz_database.php	117	discuz_database::query(%s, Array, false, false)
9	source/class/discuz/discuz_database.php	136	db_driver_mysql->query(%s, false, false)
10	source/class/db/db_driver_mysql.php	151	db_driver_mysql->halt(%s, %d, %s)
11	source/class/db/db_driver_mysql.php	218	break()