SignalR/SignalR — pull request #3219 by timc13 (2014-08-15 17:53:07+00:00)
Title: fire and forget style async calls can cause NullReferenceException

https://github.com/SignalR/SignalR/issues/3173

http://connect.microsoft.com/VisualStudio/feedback/details/745956/getting-null-reference-exception-in-asp-net-mvc-4-rc