Edited Issue: Error on UserStream.Start() when user is following somebody [1919]

I've been testing the tweetinvi API with a test account on twitter.

Initially, everything worked great. However, when I followed another user (between executions of my app) and attempted to start the stream, the stream immediately stopped with an InvalidCastException.

Stack trace:
System.InvalidCastException: Specified cast is not valid.
at Streaminvi.UserStream.UserFriends(Object friends) in c:\Users\timart\Documents\My Box Files\Development\Tweetinvi\Streaminvi\UserStream.cs:line 340
at Streaminvi.UserStream.<>c__DisplayClassc.<StartStream>b__b(String x) in c:\Users\timart\Documents\My Box Files\Development\Tweetinvi\Streaminvi\UserStream.cs:line 149
at Streaminvi.Helpers.StreamResultGenerator.StartStream(Func`2 processObject, Func`1 generateWebRequest) in c:\Users\timart\Documents\My Box Files\Development\Tweetinvi\Streaminvi\Helpers\StreamResultGenerator.cs:line 134

When I unfollow the user, the stream works just fine.