function bbp_get_topic_tags( $topic_id = 0 ) {
	$topic_id   = bbp_get_topic_id( $topic_id );
	$terms      = (array) get_the_terms( $topic_id, bbp_get_topic_tag_tax_id() );
	$topic_tags = array_filter( $terms );

	// Filter & return
	return apply_filters( 'bbp_get_topic_tags', $topic_tags, $topic_id );
}