[Closed] Switch to Vray after Corona rendering has finished

hi guys, I wanna switch to Vray after Corona rendering has finished.

Corona Pass Limit set to 5 for testing
setting save output filename
Using #postRender callback
3ds Max crash when setting current renderer to Vray
It seems like the last rendering pass isn’t over yet, or maybe saving output file hasn’t finished?
What should I do？

fn coronaGameOver = (
	callbacks.removeScripts id:#coronaGameOver
	renderers.current = vray()
)

callbacks.addScript #postRender "coronaGameOver()" id:#coronaGameOver
actionMan.executeAction 0 "50031"    --Corona Render