[wsx1]

 In your case, it is after dialog with youtube listing opened and then after you chose one, it crashed?
In any case, attach the logfile.

However, this shouldn't happen in the upcoming update since the play trailer method is changed and will now run trailer without dialog anyway. 

I try to attach log file but it's very difficult because I use it on Nvidia Shield. 

OK then you'll have to wait for the update, coming soon. In the meantime, you could try reinstalling/update the youtube addon. and which kodi you use? if leia, then update the latest nightly. i'm guessing the problem doesn't come from the skin helper service itself...

BTW, how's titan running on Nvidia Shield? and auto-trailers?
It's a relatively heavy skin, I tried running on mi-box3 (arm chipped tv android)  but it's too damn slow...

I use Kodi leila Alpha 2 for arm64 so I tre to update latest night as You suggest.
I try also to reinstall Youtube addon.
In Nvidia Shield Titan running very well. It's fast (Not in my previous h96+ box).
Auto trailers also not working (I don't know if I have to press some button in remote control)
If I can tomorrow made you a video for see how it work. Also in Android Tv new Kodi introduce Channel and support for Google assistant.