bug in get_mutal_friend 1 : SELECT SUM(Score) AS S, p1_id, p2_id FROM `LastScores` WHERE id IN (SELECT id FROM LastScores WHERE ((1337753866.8477 - date) < 31536000) AND (p1_id = OR p2_id = ) ) GROUP BY p1_id,p2_id ORDER BY S DESC LIMIT 1;