When Questions are fetched by SortOrder, it will be checked if the ID in the...

When Questions are fetched by SortOrder, it will be checked if the ID in the SortList really points to a Question

src/main/java/de/thm/arsnova/services/QuestionService.java

@@ -944,6 +944,9 @@ public class QuestionService implements IQuestionService, ApplicationEventPublis
 			List<String> questionIds = questionSortOrder.getSortOrder();
 			for (String t : questionIds) {
 				Question tempQuestion = getQuestion(t);
+				if (tempQuestion == null) {
+					break;
+				}
 				if (onlyActive) {
 					if (tempQuestion.isActive()) {
 						questions.add(tempQuestion);