diff --git a/apps/wpm/serializers.py b/apps/wpm/serializers.py
index 1814e00c..c7a0760f 100644
--- a/apps/wpm/serializers.py
+++ b/apps/wpm/serializers.py
@@ -369,10 +369,10 @@ class MlogSerializer(CustomModelSerializer):
                 mox.count_ok = instance.count_ok
                 mox.count_notok = instance.count_notok
                 mox.count_break_t = instance.count_break_t
-                mox.save()
                 for f in Mlogb._meta.fields:
                     if 'count_n_' in f.name:
                         setattr(mox, f.name, getattr(instance, f.name))
+                mox.save()
                 Mlogb.objects.filter(mlog=instance, material_out__isnull=False).exclude(id=mox.id).delete()
         return instance