private function getSectionIds(array $sectionIdentifiers): array
    {
        $idList = [];

        foreach ($sectionIdentifiers as $identifier) {
            try {
                $section = $this->sectionHandler->loadByIdentifier($identifier);
                $idList[] = $section->id;
            } catch (NotFoundException $e) {
                continue;
            }
        }

        return $idList;
    }