function bbp_admin_repair_user_topic_subscriptions() {

	// Define variables
	$bbp_db    = bbp_db();
	$statement = esc_html__( 'Removing trashed topics from user subscriptions… %s', 'bbpress' );
	$result    = esc_html__( 'Failed!', 'bbpress' );

	$key       = $bbp_db->prefix . '_bbp_subscriptions';
	$users     = $bbp_db->get_results( "SELECT `user_id`, `meta_value` AS `subscriptions` FROM `{$bbp_db->usermeta}` WHERE `meta_key` = '{$key}'" );

	if ( is_wp_error( $users ) ) {
		return array( 1, sprintf( $statement, $result ) );
	}

	$topics = $bbp_db->get_col( "SELECT `ID` FROM `{$bbp_db->posts}` WHERE `post_type` = '" . bbp_get_topic_post_type() . "' AND `post_status` = '" . bbp_get_public_status_id() . "'" );
	if ( is_wp_error( $topics ) ) {
		return array( 2, sprintf( $statement, $result ) );
	}

	$values = array();
	foreach ( $users as $user ) {
		if ( empty( $user->subscriptions ) || ! is_string( $user->subscriptions ) ) {
			continue;
		}

		$subscriptions = array_intersect( $topics, explode( ',', $user->subscriptions ) );
		if ( empty( $subscriptions ) || ! is_array( $subscriptions ) ) {
			continue;
		}

		$subscriptions_joined = implode( ',', $subscriptions );
		$values[]             = "('{$user->user_id}', '{$key}', '{$subscriptions_joined}')";

		// Cleanup
		unset( $subscriptions, $subscriptions_joined );
	}

	if ( !count( $values ) ) {
		$result = esc_html__( 'Nothing to remove!', 'bbpress' );
		return array( 0, sprintf( $statement, $result ) );
	}

	$sql_delete = "DELETE FROM `{$bbp_db->usermeta}` WHERE `meta_key` = '{$key}'";
	if ( is_wp_error( $bbp_db->query( $sql_delete ) ) ) {
		return array( 4, sprintf( $statement, $result ) );
	}

	foreach ( array_chunk( $values, 10000 ) as $chunk ) {
		$chunk = "\n" . implode( ",\n", $chunk );
		$sql_insert = "INSERT INTO `{$bbp_db->usermeta}` (`user_id`, `meta_key`, `meta_value`) VALUES {$chunk}";
		if ( is_wp_error( $bbp_db->query( $sql_insert ) ) ) {
			return array( 5, sprintf( $statement, $result ) );
		}
	}

	return array( 0, sprintf( $statement, esc_html__( 'Complete!', 'bbpress' ) ) );
}