diff --git a/Classes/Controller/JoblistController.php b/Classes/Controller/JoblistController.php
index 5666b370694b88f3dce22ca752f95852beb7f0ea..4b1bd2b3eca8e7ebb843e6d73f3040eedf48c744 100644
--- a/Classes/Controller/JoblistController.php
+++ b/Classes/Controller/JoblistController.php
@@ -26,6 +26,7 @@ namespace SGalinski\SgJobs\Controller;
  *  This copyright notice MUST APPEAR in all copies of the script!
  ***************************************************************/
 
+use Psr\Http\Message\ResponseInterface;
 use SGalinski\ProjectBase\Domain\Repository\CountryRepository;
 use SGalinski\SgJobs\Domain\Model\Job;
 use SGalinski\SgJobs\Domain\Model\JobApplication;
@@ -686,7 +687,7 @@ class JoblistController extends ActionController {
 	/**
 	 * If for any reason something goes wrong, delete the tmp upload folder
 	 *
-	 * @return void
+	 * @return mixed
 	 * @throws NoSuchArgumentException
 	 */
 	public function errorAction() {
@@ -695,7 +696,7 @@ class JoblistController extends ActionController {
 			$this->deleteTmpFolder($folderName);
 		}
 
-		parent::errorAction();
+		return parent::errorAction();
 	}
 
 	/**
diff --git a/Classes/Domain/Model/Job.php b/Classes/Domain/Model/Job.php
index 994c39333234754f664c3518bea5e6e39a06aa21..a5ba2aaa66ae73bf72f02072a515588d46d91ef8 100644
--- a/Classes/Domain/Model/Job.php
+++ b/Classes/Domain/Model/Job.php
@@ -108,7 +108,7 @@ class Job extends AbstractEntity {
 	/**
 	 * @var \SGalinski\SgJobs\Domain\Model\Company $company
 	 */
-	protected $company = '';
+	protected $company;
 
 	/**
 	 * @var string $description
diff --git a/Classes/Hooks/PageLayoutView/PluginRenderer.php b/Classes/Hooks/PageLayoutView/PluginRenderer.php
index ac9cae73cb80cad3481d5585aa6fffc4805f7d5b..226dc649dbab2f8edd1ee086febbfd92b571d6d9 100644
--- a/Classes/Hooks/PageLayoutView/PluginRenderer.php
+++ b/Classes/Hooks/PageLayoutView/PluginRenderer.php
@@ -87,8 +87,8 @@ class PluginRenderer implements \TYPO3\CMS\Backend\View\PageLayoutViewDrawItemHo
 	 * Adapts the given $headerContent.
 	 * To be used in all plugin previews so the Header Contents appear similarly.
 	 *
-	 * @param $headerContent
-	 * @param $row
+	 * @param string $headerContent
+	 * @param array $row
 	 */
 	protected function adaptPluginHeaderContent(&$headerContent, $row): void {
 		$headerContent = '<h4>' . $this->getPluginNameForHeaderContent(
diff --git a/Classes/Paginator/QueryResultRawPaginator.php b/Classes/Paginator/QueryResultRawPaginator.php
index 5452162c76932a58a94ea3269f5c4a2fa80fdb99..b255a54a6be37a1ce235ebf73e71a100ab0e5e34 100644
--- a/Classes/Paginator/QueryResultRawPaginator.php
+++ b/Classes/Paginator/QueryResultRawPaginator.php
@@ -31,7 +31,7 @@ final class QueryResultRawPaginator extends AbstractPaginator {
 	private $queryResult;
 
 	/**
-	 * @var QueryResultInterface
+	 * @var \TYPO3\CMS\Extbase\Persistence\QueryResultInterface|object[]
 	 */
 	private $paginatedQueryResult;
 
diff --git a/Classes/Service/BackendService.php b/Classes/Service/BackendService.php
index 073debe0c3109eb8fce7298f678883d91639d287..c107a90e5aaa122ec77932caa4dc24babb422258 100644
--- a/Classes/Service/BackendService.php
+++ b/Classes/Service/BackendService.php
@@ -55,7 +55,7 @@ class BackendService {
 			->from('pages')
 			->where(
 				$queryBuilder->expr()->eq('is_siteroot', $queryBuilder->createNamedParameter(1, \PDO::PARAM_INT))
-			)->execute()->fetchAll();
+			)->execute()->fetchAllAssociative();
 
 		foreach ($rows as $row) {
 			$pageInfo = BackendUtility::readPageAccess($row['uid'], $GLOBALS['BE_USER']->getPagePermsClause(1));
@@ -129,7 +129,7 @@ class BackendService {
 		$rows = $queryBuilder->select('pid')
 			->from('tx_sgjobs_domain_model_job')
 			->groupBy('pid')
-			->execute()->fetchAll();
+			->execute()->fetchAllAssociative();
 		foreach ($rows as $row) {
 			$pageInfo = BackendUtility::readPageAccess($row['pid'], $GLOBALS['BE_USER']->getPagePermsClause(1));
 			if ($pageInfo) {
diff --git a/Classes/Service/SitemapService.php b/Classes/Service/SitemapService.php
index ed0d6a8f26d5d7cb7da373c04b0087b66d72a687..b79752064066976c6b2a4b70a70bbcc80f3e8e90 100644
--- a/Classes/Service/SitemapService.php
+++ b/Classes/Service/SitemapService.php
@@ -60,7 +60,7 @@ class SitemapService {
 			->execute();
 
 		$context = GeneralUtility::makeInstance(Context::class);
-		while ($row = $databaseResource->fetch()) {
+		while ($row = $databaseResource->fetchAssociative()) {
 			try {
 				$site = GeneralUtility::makeInstance(SiteFinder::class)->getSiteByPageId($row['pid']);
 				if ($rootPageId > 0 && $site->getRootPageId() !== $rootPageId) {