EXO‘s Kai was the latest idol to fall into a random stage abyss, and fortunately, he wasn’t too seriously injured.
I’m not familiar enough with stage work to say whether or not this is a common thing, but I hardly ever hear about this outside of K-pop and it seems like it’s happening more and more frequently for questionable reasons.
Seriously though, it’s only a matter of time before somebody falls wrong and gets hurt bad.