diff --git a/Services/SaleOrderService.cs b/Services/SaleOrderService.cs
index bec5b2d..e4febe7 100644
--- a/Services/SaleOrderService.cs
+++ b/Services/SaleOrderService.cs
@@ -85,11 +85,11 @@ WHERE
             var resultString = JsonConvert.SerializeObject(resultDict);
             var result = JsonConvert.DeserializeObject<KingdeeResult<SaleExecuteOut>>(resultString);
             var rows = result.Result.Rows;
-            var dataRow = rows.Where(n => n.FBILLNO == billNo).FirstOrDefault();
-            if (dataRow == null)
+            if (rows == null || rows.Count == 0)
             {
                 return 0m;
             }
+            var dataRow = rows.FirstOrDefault(n => n.FBILLNO == billNo);
             if (dataRow.FALLMATCHAMOUNT.IsNullOrEmptyOrWhiteSpace())
             {
                 return 0m;