Ok, thank you very much. I thought it was a compatibility issue.
It crashes when i load the game... will do some more investigation, if nobody knows how to solve it.
(I'm on 8.1 emunand, sx OS 2.9.4, retroarch 1.8.8)
Are you using title redirect? (hold R on a switch game and launch it) to access Retroarch? If not it will probably crash.