Index: iknow-api/Repository/Interface/IUserRepository.cs
===================================================================
--- iknow-api/Repository/Interface/IUserRepository.cs	(revision ff202cffe227f3226587a67fc50b6f4defb4418a)
+++ iknow-api/Repository/Interface/IUserRepository.cs	(revision 22439d39a1468bfd0fca78d12c92e3dc15b6016e)
@@ -1,3 +1,3 @@
-using iknow_api.Models;
+using iknow_api.Models;
 namespace iknow_api.Repositories
 {
@@ -11,5 +11,5 @@
         Task AddHighSchoolAsync(HighSchool highSchool);
         Task<int> GetUsersCountAsync();
-        Task<User> GetUserByIdAsync(int id);
+        Task<User?> GetUserByIdAsync(int id);
         Task<User?> GetOnlyUserByIdAsync(int id);