Prevent errors when a not authenticated user tries to see a user detail page

apps/registration/tests.py

@@ -31,6 +31,10 @@ class TestIndexPage(TestCase):
         response = self.client.get(reverse("registration:reset_admin"))
         self.assertRedirects(response, reverse("login") + "?next=" + reverse("registration:reset_admin"), 302, 200)
 
+        User.objects.create()
+        response = self.client.get(reverse("registration:user_detail", args=(1,)))
+        self.assertRedirects(response, reverse("login") + "?next=" + reverse("registration:user_detail", args=(1,)))
+
 
 class TestRegistration(TestCase):
     def setUp(self) -> None:

apps/registration/views.py

@@ -158,6 +158,8 @@ class UserDetailView(LoginRequiredMixin, DetailView):
 
     def dispatch(self, request, *args, **kwargs):
         user = request.user
+        if not user.is_authenticated:
+            return self.handle_no_permission()
         # Only an admin or the concerned user can see the information
         if not user.registration.is_admin and user.pk != kwargs["pk"]:
             raise PermissionDenied