Use forms preficēs for safety reasons.

biscuit/apps/alsijil/views.py

@@ -32,7 +32,7 @@ def lesson(request: HttpRequest, week: Optional[int] = None, period_id: Optional
     if lesson_period:
         # Create or get lesson documentation object; can be empty when first opening lesson
         lesson_documentation, created = LessonDocumentation.objects.get_or_create(lesson_period=lesson_period, week=wanted_week)
-        lesson_documentation_form = LessonDocumentationForm(request.POST or None, instance=lesson_documentation)
+        lesson_documentation_form = LessonDocumentationForm(request.POST or None, instance=lesson_documentation, prefix='leson_documentation')
 
         # Create all missing personal notes about members of all groups in lesson
         for group in lesson_period.lesson.groups.all():
@@ -42,7 +42,7 @@ def lesson(request: HttpRequest, week: Optional[int] = None, period_id: Optional
 
         # Create a formset that holds all personal notes for all persons in this lesson
         persons_qs = PersonalNote.objects.filter(lesson_period=lesson_period, week=wanted_week)
-        personal_note_formset = PersonalNoteFormSet(request.POST or None, queryset=persons_qs)
+        personal_note_formset = PersonalNoteFormSet(request.POST or None, queryset=persons_qs, prefix='personal_notes')
 
         if request.method == 'POST':
             if request.POST.get('action', None) == 'lesson_documentation':