[@null Member 19 years, 3 months ago]

Fixed it. For some reason putting

$forum_one_topics = $bbdb->get_results("SELECT * FROM $bbdb->topics WHERE forum_id = $forum_id ORDER BY topic_time DESC LIMIT 0,$number_of_topics")

in index.php gives the error, but placing it into front-page.php fixes it, no errors and it works…