diff --git a/apps/wpm/serializers.py b/apps/wpm/serializers.py
index 351a8246..83e1f087 100644
--- a/apps/wpm/serializers.py
+++ b/apps/wpm/serializers.py
@@ -353,6 +353,7 @@ class MlogSerializer(CustomModelSerializer):
             wm_in = instance.wm_in
             if wm_in:
                 batch_in = wm_in.batch
+            mlogbin = None
             if instance.material_in: # 如果有消耗
                 add_dict = {
                     'mlog': instance, 'batch': batch_in, 'wm_in': wm_in,
@@ -417,6 +418,8 @@ class MlogSerializer(CustomModelSerializer):
                 ddict = {}
                 if wm_in:
                     ddict = {"batch_ofrom": wm_in.batch_ofrom, "material_ofrom": wm_in.material_ofrom}
+                if mlogbin:
+                    ddict["mlogb_from"] = mlogbin
                 mlogb, _ = Mlogb.objects.get_or_create(**add_dict_2, defaults=ddict)
                 if need_mdfect:
                     mlogb_defect_objects = [