Null clip

Hi, I'm working a project that use a playlist controller to switch between differents songs.
I have different "main" songs that are in the playlist at the start.
I have a video player that adds a song to the playlist when the video is played.
Currently, the video song is added, the song starts and the fade between the 2 songs work perfectly.
I want my user to be able to pause the video and the song and unpause it.

When i call MasterAudio.Unpause(), i get this error. 
NullReferenceException: Object reference not set to an instance of an object
DarkTonic.MasterAudio.PlaylistController.GetClipDuration (UnityEngine.AudioSource src) (at Assets/_External/Plugins/DarkTonic/MasterAudio/Scripts/Utility/PlaylistController.cs:1920)

I fixed it by adding this checker at line 885 of the masteraudio PlayListController script.

if (_transitioningAudio.clip != null)



{



        ScheduleClipPlay(newSongStartOffset, _transitioningAudio, true);



}

I'm 80% sure I didnt have this error before upgrading my unity version, but I thought i should let you know. 
I might not be using your features correctly, and if you think its the case with the few lines I just wrote, please let me know  

Thank you and have a nice day!

Colin