Unity game crashes when Ad is in production mode

Unity Services
,
1

I’ve done testing through test mode, uploaded on play store as internal test and everything was fine.
When I switched the mode to production mode on Unity Ad, app crashes after Ad complete.
How can I debug this situation?

2

Solved.
Actually Happens to be a bug in Advertisement Asset.
Known issue, and said will be solved in 4.2.0.

Meanwhile the solution is to make

IEnumerator callback{
    yield return null
   // do stuff after Unity Ad Event Fired
}

and then on the event you want to run callback, (in my case onWatchCompleted)

public void onWatchCompleted(){
   StartCoroutine(callback());
}

this will put callback method on main thread.