diff --git a/apps/qm/views.py b/apps/qm/views.py
index f07112e5..4e72a8e4 100644
--- a/apps/qm/views.py
+++ b/apps/qm/views.py
@@ -64,7 +64,9 @@ class QctViewSet(CustomModelViewSet):
         sr.is_valid(raise_exception=True)
         vdata = sr.validated_data
         qct = Qct.get(vdata["material"], vdata["tag"], vdata.get("type", None))
-        return Response(QctDetailSerializer(instance=qct).data)
+        if qct:
+            return Response(QctDetailSerializer(instance=qct).data)
+        return Response()
 
 
 class QctTestItemViewSet(CustomModelViewSet):