diff --git a/sf_manufacturing/models/mrp_production.py b/sf_manufacturing/models/mrp_production.py
index 66ab3183..a7e9398c 100644
--- a/sf_manufacturing/models/mrp_production.py
+++ b/sf_manufacturing/models/mrp_production.py
@@ -381,8 +381,8 @@ class MrpProduction(models.Model):
             # 如果制造订单的功能刀具为【无效刀】则制造订单状态改为返工
             if production.tool_state == '2':
                 production.state = 'rework'
-            if all(wo_state in ('done', 'rework', 'cancel') for wo_state in production.workorder_ids.mapped('state')):
-                if production.state not in ['scrap', 'rework']:
+            if production.workorder_ids and all(wo_state in ('done', 'rework', 'cancel') for wo_state in production.workorder_ids.mapped('state')):
+                if production.state not in ['scrap', 'rework', 'cancel']:
                     production.state = 'done'