public static function getBlame($blameGuid)
    {
        $self = static::buildNoInitModel();
        if (empty($blameGuid) || empty($self->multiBlamesClass) ||
            !is_string($self->multiBlamesClass) || $self->multiBlamesAttribute === false) {
            return null;
        }
        $mbClass = $self->multiBlamesClass;
        return $mbClass::findOne($blameGuid);
    }