Index: iknow-api/Models/EnrolledSemesters.cs
===================================================================
--- iknow-api/Models/EnrolledSemesters.cs	(revision aee2b88c7a15b0b0d323790d18c133b41446ff41)
+++ iknow-api/Models/EnrolledSemesters.cs	(revision ea405569ef29f56fbfc4d77708b6b3faf9286097)
@@ -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; }