Commented Unassigned: Crash while handling SSH_MSG_CHANNEL_CLOSE message [2538]

The application crashed. Crash dump analysis indicate a possible race condition
at handling SSH_MSG_CHANNEL_CLOSE message.

2014-10-12 01:05:44,805 FATAL
System.NullReferenceException: Object reference not set to an instance of an object.
at Renci.SshNet.Sftp.SubsystemSession.RaiseError(Exception error)
at Renci.SshNet.Sftp.SubsystemSession.Session_ErrorOccured(Object sender, ExceptionEventArgs e)
at System.EventHandler`1.Invoke(Object sender, TEventArgs e)
at Renci.SshNet.Session.RaiseError(Exception exp)
at Renci.SshNet.Session.MessageListener()
at Renci.SshNet.Session.<Connect>b__17()
at Renci.SshNet.Session.<>c__DisplayClass3.<ExecuteThread>b__2(Object o)
at System.Threading.QueueUserWorkItemCallback.WaitCallback_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
at System.Threading.ThreadPoolWorkQueue.Dispatch()
at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()
Comments: ** Comment from web user: jk79 **

I was using version 2013.4.7.0. I don't think I can reproduce the error easily, as it happened in production environment.