unhandle exception while adding value to owin session

[genialguy1]

im new to owin. I have a situation. I have 2 .net web forms applications. App_1 is a dashboard/landing page application. App_2 is the main application. App_1 is authenticated using the Identity server 4, it loads all the user profile and other data related to the business. then it goes to App_2. App_2 is the main website. So i need to carry the data from app_1 to app_2. before using owin it was done by http session. when i started using owin, the default session didnt work. so added this middle to both of my webform app. but when i redirect the user from app_1 to app_2, i simply get an unhandled exception.

This is what something im trying to do.
App_1:
var owinsession = HttpContext.Current.GetOwinContext().GetSessionContext();
owinsession.AddOrUpdate("test", "hello world");
Response.Redirect(url);
Im trying to retrieve this session variable in App_2. But once the redirection statement is exectuted
an exception is thrown in owinsession.AddOrUpdate() in this line.