I just played some more to check. Out of 8 (I think?) plays, it happened 3 times. I think it only happens at the exact moment you click Vote, but it's hard to say for sure (one of them felt like it was immediately before).
Viewing post in 19th Century Government Simulator jam comments
Huh that's strange, the vote button doesn't cause the blackout animation to trigger so if it goes black it must have crashed the game or something. It didn't happen for me or my friend so far when we've played it on the browser, though the rng functions seems to have been messed up in html5. Maybe it's an issue with a specific browser or os then, very strange.