diff --git a/Controllers/RecruitController.cs b/Controllers/RecruitController.cs
index dbcebd0..fb74b0e 100644
--- a/Controllers/RecruitController.cs
+++ b/Controllers/RecruitController.cs
@@ -1538,8 +1538,8 @@ namespace BMA.EHR.Recruit.Service.Controllers
                     {
                         foreach (var x in _oldScores)
                         {
-                            x.Number = null;
-                            x.RemarkExamOrder = null;
+                            x.Number = string.Empty;
+                            x.RemarkExamOrder = string.Empty;
                         }
                         await _context.SaveChangesAsync();
                     }