Forum link to phpBB community broken

In Area51 forums, when I follow the forumlink to phpBB forum, it results in an error:

General Error
SQL ERROR [ mysqli ]

Unknown column 'forum_posts' in 'field list' [1054]

SQL

UPDATE phpbb_forums SET forum_posts = forum_posts + 1 WHERE forum_id = 12

BACKTRACE

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

FILE: [ROOT]/includes/db/driver/driver.php
LINE: 809
CALL: trigger_error()

FILE: [ROOT]/includes/db/driver/mysqli.php
LINE: 187
CALL: phpbb_db_driver->sql_error()

FILE: [ROOT]/viewforum.php
LINE: 110
CALL: phpbb_db_driver_mysqli->sql_query()