Kevin, you fixed this bug some time ago, would you like to tag it as status-complete?
Sometime last week, this route stopped throwing 404 like the rest of my 'bad id' tests and started throwing 500. It seems to be the odd man out.
Soapi.ApiException : A generic error has occurred on the server; developers have been notified. StatusCode:InternalServerError Url:http://api.stackoverflow.com/0.9/questions/2147483647/timeline ----> System.Net.WebException : The remote server returned an error: (500) Internal Server Error.