Error on database when upgrading

Just upgraded from alpha 8 to 9, and I have some errors when running update.php :

* user warning: Table 'advforum_last_post' already exists query: CREATE TABLE advforum_last_post ( tid int unsigned NOT NULL default '0', nid int unsigned NOT NULL default '0', cid int unsigned NOT NULL default '0', PRIMARY KEY (tid) ) /*!40100 DEFAULT CHARACTER SET utf8 */; in /Applications/MAMP/htdocs/scoresport/includes/database.mysql.inc on line 172.

* user warning: 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 ' 0)' at line 1 query: INSERT INTO advforum_last_post (tid, nid, cid) VALUES(5, , 0) in /Applications/MAMP/htdocs/scoresport/includes/database.mysql.inc on line 172.

* user warning: 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 ' 0)' at line 1 query: INSERT INTO advforum_last_post (tid, nid, cid) VALUES(6, , 0) in /Applications/MAMP/htdocs/scoresport/includes/database.mysql.inc on line 172.

on the latest post, the titles are not displayed anymore. All works fine when dowgrading back to alpha 8

any ideas ?