diff --git a/be/Modules/Store/src/Win_in.Sfs.Wms.Store.Event/Orders/PurchaseOrderEventHandler.cs b/be/Modules/Store/src/Win_in.Sfs.Wms.Store.Event/Orders/PurchaseOrderEventHandler.cs
index 373067035..5fa8594c1 100644
--- a/be/Modules/Store/src/Win_in.Sfs.Wms.Store.Event/Orders/PurchaseOrderEventHandler.cs
+++ b/be/Modules/Store/src/Win_in.Sfs.Wms.Store.Event/Orders/PurchaseOrderEventHandler.cs
@@ -158,7 +158,12 @@ public class PurchaseOrderEventHandler
         //供应商时间窗口
         var dayOfWeek = new List<string>() { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };
         var chineseWeek= dayOfWeek[Clock.Now.DayOfWeek.GetHashCode()];   //中文星期
-        var dateTimeWindowDto=supplierTimeWindowDtos.First(p => p.Week == chineseWeek);
+        var dateTimeWindowDto=supplierTimeWindowDtos.FirstOrDefault(p => p.Week == chineseWeek);
+        if (dateTimeWindowDto == null)
+        {
+            throw new UserFriendlyException($"供应商时间窗口当前时间【{chineseWeek}】不存在");
+        }
+        
         supplierAsnEditInput.TimeWindow = dateTimeWindowDto.TimeSlot;
 
         //生效日期