diff --git a/Model/VMCourse.cs b/Model/VMCourse.cs
index 8b36759..88ed667 100644
--- a/Model/VMCourse.cs
+++ b/Model/VMCourse.cs
@@ -53,7 +53,7 @@ namespace NP.Model
         public PayItem PayItem { get; set; }
         public PPLog PPLog { get; set; }
 
-        public int selMonth { get; set; }
-        public int isCompany { get; set; }
+        public int? selMonth { get; set; }
+        public int? isCompany { get; set; }
     }
 }