Error while approving post

[tomxp411]

Got this just now while approving post. Post was approved though.

SQL ERROR [ mysqli ]

BIGINT UNSIGNED value is out of range in '(cxonesix_forum2.phpbb_forums.forum_posts_unapproved - 1)' [1690]

SQL

UPDATE phpbb_forums SET forum_posts_unapproved = forum_posts_unapproved - 1, forum_posts_approved = forum_posts_approved + 1 WHERE forum_id = 2

BACKTRACE

FILE: (not given by php)
LINE: (not given by php)
CALL: msg_handler()

FILE: [ROOT]/phpbb/db/driver/driver.php
LINE: 1023
CALL: trigger_error()

FILE: [ROOT]/phpbb/db/driver/mysqli.php
LINE: 202
CALL: phpbb\db\driver\driver->sql_error()

FILE: [ROOT]/phpbb/db/driver/factory.php
LINE: 345
CALL: phpbb\db\driver\mysqli->sql_query()

FILE: [ROOT]/phpbb/content_visibility.php
LINE: 614
CALL: phpbb\db\driver\factory->sql_query()

FILE: [ROOT]/includes/mcp/mcp_queue.php
LINE: 763
CALL: phpbb\content_visibility->set_post_visibility()

FILE: [ROOT]/includes/mcp/mcp_queue.php
LINE: 60
CALL: mcp_queue::approve_posts()

FILE: [ROOT]/includes/functions_module.php
LINE: 676
CALL: mcp_queue->main()

FILE: [ROOT]/mcp.php
LINE: 345
CALL: p_master->load_active()