diff --git a/sf_manufacturing/models/purchase_order.py b/sf_manufacturing/models/purchase_order.py
index f4a7be81..111c09e3 100644
--- a/sf_manufacturing/models/purchase_order.py
+++ b/sf_manufacturing/models/purchase_order.py
@@ -99,7 +99,7 @@ class PurchaseOrder(models.Model):
         res = super(PurchaseOrder, self).button_confirm()
         for line in self.order_line:
             # 将产品不追踪序列号的行项目设置qty_done
-            if line.move_ids[0].product_id.tracking == 'none':
+            if line.move_ids and line.move_ids[0].product_id.tracking == 'none':
                 line.move_ids[0].quantity_done = line.move_ids[0].product_qty
         return res