Giving Error When I Am Checking Condition In Navbar To Check Session Exist Or Not

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C#3.5

MVC5

unable to check condition whether userid is there or not in session ,but if its 0 its giving error i

An exception of type ;System.Web.HttpException' occurred in System.Web.dll but was not handled in user code

Additional information: Error executing child request for handle;System.Web.Mvc.HttpHandlerUtil+ServerExecuteHttpHandlerAsyncWrapper'