try to run the following queries:
Code:
ALTER TABLE " . TABLE_PREFIX . "games_champs MODIFY champ_mid INT(10) DEFAULT '0' NOT NULL
ALTER TABLE " . TABLE_PREFIX . "games_list MODIFY bestmid INT(10) DEFAULT '0' NOT NULL
ALTER TABLE " . TABLE_PREFIX . "games_session MODIFY mid INT(10) DEFAULT '0' NOT NULL
Please let me know if this fixes the problem, as it will be part of v2.6.8+ then