How to add tracks to already running Tweetinvi Filtered Stream


I am using following code to add new track to an ready running Filtered Stream, using Tweetinvi C# library.

------ Code ref: -------
filteredStream.StartStreamMatchingAnyCondition(); // OR // filteredStream.ResumeStream();

As soon as the last line executes, it just STOPS tracking any tweets from any of already tracked users (@mentions). And after some time, the stream automatically ended up with following error:
“Value can not be Null. Parameter name: source”


Any help please?