diff --git a/apps/wpm/views.py b/apps/wpm/views.py
index 1827d5b3..dc2f255b 100644
--- a/apps/wpm/views.py
+++ b/apps/wpm/views.py
@@ -563,7 +563,8 @@ class MlogbInViewSet(CreateModelMixin, UpdateModelMixin, DestroyModelMixin, Cust
                 Ftest.objects.filter(id__in=ftestIds).delete()
         if ins.mlogb_to:
             ins.mlogb_to.delete()
-        Mlogb.objects.filter(id__in=Mlogbw.objects.filter(mlogb=ins).values_list("mlogb_to__id", flat=True)).delete()
+        mlogb_to_ids = list(Mlogbw.objects.filter(mlogb=ins).values_list("mlogb_to__id", flat=True))
+        Mlogb.objects.filter(id__in=mlogb_to_ids).delete()
         ins.delete()
 
     @transaction.atomic