User Save() error

im making an Ajax call to an ashx page where i need to change which group a user is located in.

in the ashx file i make a call to the following function:

public static void Valid(int id)
        {
            User current = User.GetUserByID(id);
            if (!current.HasGroup(6143420))
            {
                current.AddToGroup(6143420);
                current.RemoveFromGroup(6143422);
                current.Save();
            }

        }

but that unfortunately results in an error however the user actually gets transferred into the right group.


[NullReferenceException: Object reference not set to an instance of an object.]
   Dynamicweb.Modules.UserManagement.User.get_Current(PagePermissionLevels level) +431
   Dynamicweb.Modules.UserManagement.User.Save() +201
   CvrChecker.Helpers.Valid(Int32 id) +203
   CvrChecker.CheckCVR.ProcessRequest(HttpContext context) +2179
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +624
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously) +269

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User Save() error

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