Problem: When submitting calls for different customers in multiple tabs on the same browser, a null reference exception appears:

ERROR Miner.Responder.Web.Default [(null)] - Error during asynchronous postback
System.NullReferenceException: Object reference not set to an instance of an object.
at Miner.Responder.Web.Presentation.CustomerCallEntryPresenter.UpdatePhoneNumbers(Customer customer, PhoneList newPhoneNumbers)

And this:

ERROR Miner.Responder.Web.Global [(null)] - http://fynch/Responder/Authorized/CSR/CustomerCallEntry.aspx
Uncaught exception
System.Web.HttpUnhandledException: Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.NullReferenceException: Object reference not set to an instance of an object.
at Miner.Responder.Web.Presentation.CustomerCallEntryPresenter.UpdatePhoneNumbers(Customer customer, PhoneList newPhoneNumbers)

Fix: Configure the Web.config file to permit multiple sessions per browser. This adds a number to the Responder Web address in the browser window, and prevents this null error.

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