diff --git a/apps/participation/views.py b/apps/participation/views.py
index 7ba66fe..d0c585e 100644
--- a/apps/participation/views.py
+++ b/apps/participation/views.py
@@ -480,7 +480,7 @@ class ParticipationDetailView(LoginRequiredMixin, DetailView):
                 and user.registration.team.participation \
                 and user.registration.team.participation.pk == kwargs["pk"] \
                 or user.registration.is_volunteer \
-                and self.object.tournament in user.registration.interesting_tournaments:
+                and self.get_object().tournament in user.registration.interesting_tournaments:
             return super().dispatch(request, *args, **kwargs)
         raise PermissionDenied