Filter queryset in GameEndView to exclude completed games

game/views.py

@@ -465,6 +465,9 @@ class GameAnswerView(LoginRequiredMixin, DetailView):
 class GameEndView(LoginRequiredMixin, SingleObjectMixin, View):
     model = models.MusikGame
 
+    def get_queryset(self):
+        return super().get_queryset().filter(over=False)
+
     def post(self, request, pk):
         game = self.get_object()
         if not game.group.is_leader(request.user):