diff --git a/designer_v2/lib/features/design/shared/questionnaire/question/controllers/bool_question_form_controller.dart b/designer_v2/lib/features/design/shared/questionnaire/question/controllers/bool_question_form_controller.dart
index 2bf06b518..4bf449494 100644
--- a/designer_v2/lib/features/design/shared/questionnaire/question/controllers/bool_question_form_controller.dart
+++ b/designer_v2/lib/features/design/shared/questionnaire/question/controllers/bool_question_form_controller.dart
@@ -8,7 +8,7 @@ import 'package:studyu_designer_v2/localization/app_translation.dart';
 
 class BoolQuestionFormViewModel extends QuestionFormViewModel<BoolQuestionFormData> {
   BoolQuestionFormViewModel({
-    super.formData,
+    BoolQuestionFormData? super.formData,
     super.delegate,
     super.validationSet = StudyFormValidationSet.draft,
     titles,
diff --git a/designer_v2/lib/features/design/shared/questionnaire/question/controllers/choice_question_form_controller.dart b/designer_v2/lib/features/design/shared/questionnaire/question/controllers/choice_question_form_controller.dart
index 2a88b9f42..87c25e648 100644
--- a/designer_v2/lib/features/design/shared/questionnaire/question/controllers/choice_question_form_controller.dart
+++ b/designer_v2/lib/features/design/shared/questionnaire/question/controllers/choice_question_form_controller.dart
@@ -10,7 +10,7 @@ import 'package:studyu_designer_v2/utils/validation.dart';
 
 class ChoiceQuestionFormViewModel extends QuestionFormViewModel<ChoiceQuestionFormData> {
   ChoiceQuestionFormViewModel({
-    super.formData,
+    ChoiceQuestionFormData? super.formData,
     super.delegate,
     super.validationSet = StudyFormValidationSet.draft,
     titles,
diff --git a/designer_v2/lib/features/design/shared/questionnaire/question/controllers/scale_question_form_controller.dart b/designer_v2/lib/features/design/shared/questionnaire/question/controllers/scale_question_form_controller.dart
index 0219faa82..4a666080a 100644
--- a/designer_v2/lib/features/design/shared/questionnaire/question/controllers/scale_question_form_controller.dart
+++ b/designer_v2/lib/features/design/shared/questionnaire/question/controllers/scale_question_form_controller.dart
@@ -13,7 +13,7 @@ import 'package:studyu_designer_v2/utils/color.dart';
 
 class ScaleQuestionFormViewModel extends QuestionFormViewModel<ScaleQuestionFormData> {
   ScaleQuestionFormViewModel({
-    super.formData,
+    ScaleQuestionFormData? super.formData,
     super.delegate,
     super.validationSet = StudyFormValidationSet.draft,
     titles,