+# -*- coding: utf-8 -*-
+# This file is part of KOED-Quiz, licensed under GNU Affero GPLv3 or later.
+# Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
+#
 from django.shortcuts import get_object_or_404, render, redirect
 
 from quiz.forms import QuestionForm
         cur_index = ticket.index(request.path)
         if cur_index:
             previous_url = ticket[cur_index - 1]
-    else:
+    elif ticket:
         valid_url = ticket[-1]
 
     if request.method == 'POST' and valid:
         cur_index = ticket.index(request.path)
         if cur_index:
             previous_url = ticket[cur_index - 1]
-    else:
+    elif ticket:
         valid_url = ticket[-1]
 
-
     result = get_object_or_404(Quiz.current().result_set, slug=slug)
     return render(request, "quiz/result_detail.html", locals())