Index: iknow-api/Models/EnrolledSemesters.cs
===================================================================
--- iknow-api/Models/EnrolledSemesters.cs	(revision 2e17229353155473cf2d2d9d350c50ee7be12fe2)
+++ iknow-api/Models/EnrolledSemesters.cs	(revision 1b20b226a74790f84dc06dc488f4f761b510a3f2)
@@ -14,6 +14,6 @@
         public string? Note { get; set; }
         public DateTime CratedAt { get; set; }
-        public DateTime LastChange { get; set; }
-        public DateTime Verified { get; set; }
+        public DateTime? LastChange { get; set; }
+        public DateTime? Verified { get; set; }
         public int SemesterId { get; set; }
         public ActiveSemesters? Semester { get; set; }