see comments

src/components/layout/RichTextEditor.tsx

@@ -54,7 +54,7 @@ const RichTextEditor: React.FC<RichTextEditorProps> = ({
   // Sync editor content when value prop changes (for edit mode)
   useEffect(() => {
     if (editor && value !== editor.getHTML()) {
-      editor.commands.setContent(value);
+      editor.commands.setContent(value, { emitUpdate: false });
     }
   }, [editor, value]);
 

src/modules/courses/actions/course-actions.ts

@@ -348,6 +348,7 @@ export async function updateCourse(
 
     // Schritt 9: Next.js Cache für /courses Seite invalidieren
     revalidatePath("/courses");
+    revalidatePath(`/courses/edit/${courseId}`);
 
     return {
       success: true,

src/modules/courses/ui/views/course-create-view.tsx

@@ -90,7 +90,11 @@ const CourseCreateView = ({
       // Format date for input field (YYYY-MM-DD)
       if (initialData.date) {
         const date = new Date(initialData.date);
-        const formattedDate = date.toISOString().split("T")[0];
+        const formattedDate = [
+          date.getFullYear(),
+          String(date.getMonth() + 1).padStart(2, "0"),
+          String(date.getDate()).padStart(2, "0"),
+        ].join("-");
         setCourseDate(formattedDate);
       }
 
@@ -159,9 +163,13 @@ const CourseCreateView = ({
         weekdays: selectedWeekdays.length > 0 ? selectedWeekdays : undefined,
       };
 
+      if (mode === "edit" && !courseId) {
+        throw new Error("Missing courseId in edit mode");
+      }
+
       const result =
-        mode === "edit" && courseId
-          ? await updateCourse(courseId, courseData, status)
+        mode === "edit"
+          ? await updateCourse(courseId!, courseData, status)
           : await createCourse(courseData, status);
 
       if (result.success) {

src/modules/courses/ui/views/course-edit-view.tsx

@@ -16,20 +16,25 @@ const CourseEditView = ({ courseId }: CourseEditViewProps) => {
   const [courseData, setCourseData] = useState<Course | null>(null);
 
   useEffect(() => {
+    let alive = true;
+
     const fetchCourse = async () => {
-      setIsLoading(true);
+      if (alive) setIsLoading(true);
       const result = await getCourseById(courseId);
 
       if (result.success && result.course) {
-        setCourseData(result.course);
+        if (alive) setCourseData(result.course);
       } else {
         toast.error(result.error || "Fehler beim Laden des Kurses");
-        router.push("/courses/myCourses");
+        router.push("/courses");
       }
-      setIsLoading(false);
+      if (alive) setIsLoading(false);
     };
 
     fetchCourse();
+    return () => {
+      alive = false;
+    };
   }, [courseId, router]);
 
   if (isLoading) {