function bbp_remove_forum_from_all_subscriptions( $forum_id = 0 ) {

	// Subscriptions are not active
	if ( ! bbp_is_subscriptions_active() ) {
		return;
	}

	// Bail if no forum
	$forum_id = bbp_get_forum_id( $forum_id );
	if ( empty( $forum_id ) ) {
		return;
	}

	// Remove forum from all subscriptions
	return bbp_remove_object_from_all_users( $forum_id, '_bbp_subscription', 'post' );
}