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

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