// category
$categoryJoin = false;
if (!empty($searchData['category_id']) && $searchData['category_id']) {
    $Categories = $searchData['category_id']->getSelfAndDescendants();
    if ($Categories) {
        $qb
        ->innerJoin('p.ProductCategories', 'pct')
        ->innerJoin('pct.Category', 'c')
        ->andWhere($qb->expr()->in('pct.Category', ':Categories'))
        ->setParameter('Categories', $Categories);
        $categoryJoin = true;
    }
}