diff --git a/src/BarCode.Web.Repositories/SerialNumbersRepositories.cs b/src/BarCode.Web.Repositories/SerialNumbersRepositories.cs
index b7ed573..6dd3621 100644
--- a/src/BarCode.Web.Repositories/SerialNumbersRepositories.cs
+++ b/src/BarCode.Web.Repositories/SerialNumbersRepositories.cs
@@ -359,7 +359,7 @@ namespace BarCode.Web.Repositories
             var list = await query.Select(s => new SerialNumberInfoResponse()
             {
                 Specifications = s.sg.Specifications,// _erpBasicDataExtendService.GetMaterialSpecifications(materials, s.serial.MaterialNumber),
-                Old_Specifications = s.serial.old_Specifications==null?"": s.serial.old_Specifications,//_erpBasicDataExtendService.GetMaterialSpecifications(materials, s.serial.Old_MaterialNumber == null ? "" : s.serial.Old_MaterialNumber),
+                Old_Specifications = s.serial.old_Specifications==null?(_erpBasicDataExtendService.GetMaterialSpecifications(materials, s.serial.Old_MaterialNumber == null ? "" : s.serial.Old_MaterialNumber)) : s.serial.old_Specifications,//_erpBasicDataExtendService.GetMaterialSpecifications(materials, s.serial.Old_MaterialNumber == null ? "" : s.serial.Old_MaterialNumber),
                 MaterialNumber = s.serial.MaterialNumber,
                 MaterialName = s.sg.MaterialName,// _erpBasicDataExtendService.GetMaterialName(materials, s.serial.MaterialNumber),
                 BarCode = s.sg.BarCode,// _erpBasicDataExtendService.GetMaterialBarCode(materials, s.serial.MaterialNumber),
@@ -497,7 +497,8 @@ namespace BarCode.Web.Repositories
             var list = await query.Select(s => new SerialNumberInfoResponse2()
             {
                 Specifications = s.sg.Specifications,//_erpBasicDataExtendService.GetMaterialSpecifications(materials, s.serial.MaterialNumber),
-                Old_Specifications = s.serial.old_Specifications == null ? "" : s.serial.old_Specifications,//_erpBasicDataExtendService.GetMaterialSpecifications(materials, s.serial.Old_MaterialNumber == null ? "" : s.serial.Old_MaterialNumber),
+                                                     //Old_Specifications = s.serial.old_Specifications == null ? "" : s.serial.old_Specifications,//_erpBasicDataExtendService.GetMaterialSpecifications(materials, s.serial.Old_MaterialNumber == null ? "" : s.serial.Old_MaterialNumber),
+                Old_Specifications = s.serial.old_Specifications == null ? (_erpBasicDataExtendService.GetMaterialSpecifications(materials, s.serial.Old_MaterialNumber == null ? "" : s.serial.Old_MaterialNumber)) : s.serial.old_Specifications,//_erpBasicDataExtendService.GetMaterialSpecifications(materials, s.serial.Old_MaterialNumber == null ? "" : s.serial.Old_MaterialNumber),
                 MaterialNumber = s.serial.MaterialNumber,
                 MaterialName = s.sg.MaterialName,// _erpBasicDataExtendService.GetMaterialName(materials, s.serial.MaterialNumber),
                 BarCode = s.sg.BarCode,//_erpBasicDataExtendService.GetMaterialBarCode(materials, s.serial.MaterialNumber),