diff --git a/apps/qm/models.py b/apps/qm/models.py
index 7c0f3570..49c29682 100644
--- a/apps/qm/models.py
+++ b/apps/qm/models.py
@@ -171,7 +171,7 @@ class Qct(CommonAModel):
     @classmethod
     def get(cls, material:Material, tag:str):
         try:
-            qct = Qct.objects.filter(qctmat__material=material, tags__contains=tag)
+            qct = Qct.objects.get(qctmat__material=material, tags__contains=tag)
         except Qct.DoesNotExist:
             try:
                 qct = Qct.objects.get(tags__contains="default")