diff --git a/apps/registration/views.py b/apps/registration/views.py
index 6997c93..a938ede 100644
--- a/apps/registration/views.py
+++ b/apps/registration/views.py
@@ -376,10 +376,10 @@ class AuthorizationTemplateView(TemplateView):
             if registration.user == self.request.user \
                     or self.request.user.is_authenticated and self.request.user.registration.is_admin:
                 context["registration"] = registration
-        if "tournament_id" in self.request.GET:
+        if "tournament_id" in self.request.GET and self.request.GET.get("tournament_id"):
             context["tournament"] = Tournament.objects.get(pk=self.request.GET.get("tournament_id"))
         else:
-            raise ValueError("Merci d'indiquer un tournoi.")
+            raise PermissionDenied("Merci d'indiquer un tournoi.")
 
         return context