diff --git a/apps/wpmw/models.py b/apps/wpmw/models.py
index 99678377..03d4f75f 100644
--- a/apps/wpmw/models.py
+++ b/apps/wpmw/models.py
@@ -103,11 +103,12 @@ class Wpr(BaseModel):
             if is_create:
                 ins.material_start = wm.material
             WprDefect.objects.filter(wpr=ins).delete()
-            if wm.defect:
-                WprDefect.objects.create(wpr=ins, defect=wm.defect, is_main=True)
         if add_version:
             ins.version = ins.version + 1
         ins.save()
+        if wm:
+            if wm.defect:
+                WprDefect.objects.create(wpr=ins, defect=wm.defect, is_main=True)
         if ftest: 
             # 通过检验变更其缺陷项
             WprDefect.objects.filter(wpr=ins).delete()