From 200a9668b54f3efa18574ee076fb2740db7c7278 Mon Sep 17 00:00:00 2001
From: Nils Reichardt <me@nils.re>
Date: Tue, 19 Sep 2023 12:56:05 +0200
Subject: [PATCH] Fix `type 'Null' is not a subtype of type 'Course' in type
 cast` when popping the course create page (#1018)

Fixes #1017
---
 app/lib/groups/src/pages/course/create/course_create_page.dart | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/app/lib/groups/src/pages/course/create/course_create_page.dart b/app/lib/groups/src/pages/course/create/course_create_page.dart
index 9c3c6856c..19274ff2b 100644
--- a/app/lib/groups/src/pages/course/create/course_create_page.dart
+++ b/app/lib/groups/src/pages/course/create/course_create_page.dart
@@ -19,6 +19,7 @@ Future<Course?> openCourseCreatePage(
   Course? course,
   String? schoolClassId,
 }) async {
+  // We use `dynamic` as type because we return either a `Course?` or `bool`.
   final createdCourse = await Navigator.push<dynamic>(
     context,
     IgnoreWillPopScopeWhenIosSwipeBackRoute(
@@ -38,7 +39,7 @@ Future<Course?> openCourseCreatePage(
       seconds: 2,
     );
   }
-  return createdCourse as Course;
+  return createdCourse is Course ? createdCourse : null;
 }
 
 Future<void> submit(BuildContext context) async {