Error in throwing 403 exception.

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WCF

service

I have requirement like before calling a wcf service method I have to check the session.if the session exists then only I will call that service method.

For that I am using WCF extensibility and Implementing "IOperationInvoker" interface

Here in Invoke() method of "IOperationInvoker" interface I am checking the session
if the session does not exists then I am throwing an 403 exception but in the web it is showing 500 internal server error.

public object Invoke(object instance, object[] inputs, out object[] outputs)
         {
             //---checking for session
             ----code for checking session--- 

             if (isSessionExist)
             {
                 return originalInvoker.Invoke(instance, inputs, out outputs);
             }
             else
             {
                 throw new System.ServiceModel.Web.WebFaultException
                                               (System.Net.HttpStatusCode.Unauthorized);
             }
         }

when I am not throwing 403 exception then there is no 500 exception.