diff --git a/apps/participation/views.py b/apps/participation/views.py
index 34e2cf0..8789d31 100644
--- a/apps/participation/views.py
+++ b/apps/participation/views.py
@@ -341,7 +341,7 @@ class TeamLeaveView(LoginRequiredMixin, TemplateView):
             return self.handle_no_permission()
         if not request.user.registration.participates or not request.user.registration.team:
             raise PermissionDenied(_("You are not in a team."))
-        if request.user.registration.team.participation.valid is not None:
+        if request.user.registration.team.participation.valid:
             raise PermissionDenied(_("The team is already validated or the validation is pending."))
         return super().dispatch(request, *args, **kwargs)