[TASK] Fix possible nullpointer exception, fixing flexform query

Classes/Controller/ListByCategoryController.php

@@ -59,9 +59,9 @@ class ListByCategoryController extends AbstractController {
 	 *
 	 * @throws \TYPO3\CMS\Extbase\Mvc\Exception\InvalidArgumentNameException
 	 */
-	public function initializeIndexAction(){
+	public function initializeIndexAction() {
 		$currentPageBrowserPage = (int) GeneralUtility::_GP('tx_sgnews_pagebrowser')['currentPage'];
-		if($currentPageBrowserPage > 0){
+		if ($currentPageBrowserPage > 0) {
 			$this->request->setArgument('currentPageBrowserPage', $currentPageBrowserPage);
 		}
 	}
@@ -94,8 +94,12 @@ class ListByCategoryController extends AbstractController {
 		$categories = [];
 		foreach ($categoryUids as $categoryUid) {
 			$category = $this->categoryRepository->findByUid($categoryUid);
+			if (!$category) {
+				continue;
+			}
+
 			$categories[$categoryUid] = $category;
-			if ($category->_getProperty('_languageUid')>0) {
+			if ($category->_getProperty('_languageUid') > 0) {
 				$originalLangCategory = $this->categoryRepository->findOriginalLanguageById($category->getUid());
 				if ($originalLangCategory) {
 					$categoriesById[$originalLangCategory->getUid()] = $originalLangCategory;

Configuration/FlexForms/ListByCategory.xml

@@ -31,7 +31,7 @@
 								<size>5</size>
 								<maxitems>99</maxitems>
 								<foreign_table>pages</foreign_table>
-								<foreign_table_where>AND sys_language_uid IN (-1, 0) AND doktype = 117 ORDER BY title</foreign_table_where>
+								<foreign_table_where>AND pages.sys_language_uid IN (-1, 0) AND pages.doktype = 117 ORDER BY pages.title</foreign_table_where>
 							</config>
 						</TCEforms>
 					</settings.categories>