diff --git a/apps/wpm/serializers.py b/apps/wpm/serializers.py
index f63cdb43..34a0bbe1 100644
--- a/apps/wpm/serializers.py
+++ b/apps/wpm/serializers.py
@@ -336,7 +336,7 @@ class MlogSerializer(CustomModelSerializer):
                 if wm_in:
                     wm_in = instance.wm_in
                     ddict = {"batch_ofrom": wm_in.batch_ofrom, "material_ofrom": wm_in.material_ofrom}
-                Mlogb.objects.create(**add_dict_2, defaults=ddict)
+                Mlogb.objects.get_or_create(**add_dict_2, defaults=ddict)
         return instance
 
     def update(self, instance, validated_data):