diff --git a/AsbCloudInfrastructure/Services/UserService.cs b/AsbCloudInfrastructure/Services/UserService.cs
index c9c938b1..beabc91d 100644
--- a/AsbCloudInfrastructure/Services/UserService.cs
+++ b/AsbCloudInfrastructure/Services/UserService.cs
@@ -46,8 +46,9 @@ namespace AsbCloudInfrastructure.Services
 
         public async Task<int> InsertAsync(UserExtendedDto dto, CancellationToken token = default)
         {
+            dto.Id = default;
             var entity = Convert(dto);
-            await AssertLoginAsync(dto.Login, token);
+            await AssertLoginIsBusyAsync(dto.Login, token);
             var userRoles = await RoleService.GetByNamesAsync(dto.RoleNames, token).ConfigureAwait(false);
             var updatedEntity = await cacheUsers.InsertAsync(entity, token).ConfigureAwait(false);
             if (userRoles?.Any() == true)
@@ -55,7 +56,7 @@ namespace AsbCloudInfrastructure.Services
             return updatedEntity?.Id ?? 0;
         }
 
-        private async Task AssertLoginAsync(string login, CancellationToken token = default)
+        private async Task AssertLoginIsBusyAsync(string login, CancellationToken token = default)
         {
             var existingUser = await cacheUsers.FirstOrDefaultAsync(u => u.Login.ToLower() == login.ToLower(), token);
             if (existingUser is not null)
@@ -89,9 +90,12 @@ namespace AsbCloudInfrastructure.Services
 
         public async Task<int> UpdateAsync(int id, UserExtendedDto dto, CancellationToken token = default)
         {
+            if (id <= 1)
+                throw new ArgumentException($"Invalid id {id}. You can't edit this user.", nameof(id));
+
             var oldUser = await cacheUsers.FirstOrDefaultAsync(u=>u.Id == id, token);
             if(oldUser.Login != dto.Login)
-                await AssertLoginAsync(dto.Login, token);
+                await AssertLoginIsBusyAsync(dto.Login, token);
 
             var userRoles = await RoleService.GetByNamesAsync(dto.RoleNames, token).ConfigureAwait(false);                
             await UpdateRolesCacheForUserAsync(id, userRoles, token);
@@ -108,10 +112,17 @@ namespace AsbCloudInfrastructure.Services
         }
 
         public Task<int> DeleteAsync(int id, CancellationToken token = default)
-        => cacheUsers.RemoveAsync(r => r.Id == id, token);
+        {
+            if (id <= 1)
+                return Task.FromResult(0);
+            return cacheUsers.RemoveAsync(r => r.Id == id, token);
+        }
 
         public Task<int> DeleteAsync(IEnumerable<int> ids, CancellationToken token = default)
-        => cacheUsers.RemoveAsync(r => ids.Contains(r.Id), token);
+        {
+            var filteredIds = ids.Where(i => i > 1).ToList();
+            return cacheUsers.RemoveAsync(r => filteredIds.Contains(r.Id), token);
+        }
 
         private IEnumerable<string> GetRolesNamesByIdUser(int idUser)
         => GetRolesByIdUser(idUser)