diff --git a/sf_manufacturing/models/mrp_workorder.py b/sf_manufacturing/models/mrp_workorder.py
index 23129578..01977926 100644
--- a/sf_manufacturing/models/mrp_workorder.py
+++ b/sf_manufacturing/models/mrp_workorder.py
@@ -1105,9 +1105,11 @@ class ResMrpWorkOrder(models.Model):
         if self.routing_type == '装夹预调':
             # 判断是否有坯料的序列号信息
             boolean = False
-            if self.production_id.move_raw_ids[0].move_line_ids:
-                if self.production_id.move_raw_ids[0].move_line_ids[0].lot_id.name:
-                    boolean = True
+            if self.production_id.move_raw_ids:
+                if self.production_id.move_raw_ids[0].move_line_ids:
+                    if self.production_id.move_raw_ids[0].move_line_ids:
+                        if self.production_id.move_raw_ids[0].move_line_ids[0].lot_id.name:
+                            boolean = True
             if not boolean:
                 raise UserError('制造订单【%s】缺少组件的序列号信息！' % self.production_id.name)
             self.pro_code = self.production_id.move_raw_ids[0].move_line_ids[0].lot_id.name