BuddyPress.org

After integrating bbpress with Buddypress/WPMU I changed <?php post_author_avatar_link(); ?> to <?php echo bp_core_get_avatar( get_post_author_id() ); ?> in order to display the avatars correctly.

Now how can I make these here work again? They stopped displaying after the integration?

–> <?php echo bb_get_avatar( $topic->topic_last_poster, '16' ); ?>

–> <?php echo bb_get_avatar( $topic->topic_poster, '16' ); ?>