Discuz! Database Error

(1062) Duplicate entry '2536' for key 'PRIMARY'

INSERT INTO common_member_newprompt SET `uid`='2536' , `data`='a:1:{s:6:\"system\";i:1;}'

PHP Debug

No.	File	Line	Code
1	forum.php	57	discuz_application->init()
2	source/class/discuz/discuz_application.php	70	discuz_application->_init_cron()
3	source/class/discuz/discuz_application.php	569	discuz_cron::run()
4	source/class/discuz/discuz_cron.php	48	include(%s)
5	source/include/cron/cron_income_notify_daily.php	28	notification_add()
6	source/function/function_core.php	1675	helper_notification::notification_add()
7	source/class/helper/helper_notification.php	128	table_common_member_newprompt->insert()
8	source/class/table/table_common_member_newprompt.php	29	discuz_database::insert()
9	source/class/discuz/discuz_database.php	60	discuz_database::query()
10	source/class/discuz/discuz_database.php	137	db_driver_mysqli->query()
11	source/class/db/db_driver_mysqli.php	152	db_driver_mysqli->halt()
12	source/class/db/db_driver_mysqli.php	227	break()