Index: iknow-api/Repository/Interface/IUserRepository.cs
===================================================================
--- iknow-api/Repository/Interface/IUserRepository.cs	(revision e423ff3504833ceb777b0ce7d95cdd29effecfed)
+++ iknow-api/Repository/Interface/IUserRepository.cs	(revision 18e0c10f860a299eef6a00ae241e60010ae158b6)
@@ -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);