League Buster triggered cause my client crashed. 15 min wait

you don't get leaver bustered for one technical glitch.

Be truthful to yourself and stop AFKing / leaving games.

I've got a kid, so sometimes I don't have a choice. The point is that a client crash shouldn't count at as leave. But, thinking about it now, I understand there's no way for riot servers to know why I left a match.

Being truthful to myself has nothing to do with it, so you, Sir, need to stop using such pointed language. Or perhaps you're so quick to judge generally offline as well, in which case, God give strength to those who have to tolerate your company.