protected function get_root_value( $default = null ) {
		$id_base = $this->id_data['base'];

		// Get all user-meta.
		// We'll use this to check if the value is set or not,
		// in order to figure out if we need to return the default value.
		$user_meta = get_user_meta( get_current_user_id() );

		// Get the single meta.
		$single_meta = get_user_meta( get_current_user_id(), $id_base, true );

		if ( isset( $user_meta[ $id_base ] ) ) {
			return $single_meta;
		}
		return $default;
	}