Could not update user post count information

DEBUG MODE

SQL Error : 1690 BIGINT UNSIGNED value is out of range in '(`mechatra_forum`.`phpbb_users`.`user_posts` - 1)'

SELECT p.poster_id, COUNT(p.post_id) AS posts FROM (phpbb_posts p, phpbb_users u) WHERE p.topic_id IN (8) AND u.user_id <> -1 AND p.poster_id = u.user_id GROUP BY p.poster_id

Line : 278
File : functions_remove.php

[PHP] pobierz, plaintext 
				{
					message_die(GENERAL_ERROR, 'Could not update user post count information', '', __LINE__, __FILE__, $sql);
				}
[PHP] pobierz, plaintext