No chest :C

check to see if you have reached your chest limit. i had the same problem earlier and discovered that i can not earn another one for 5 days. you can check this by looking at your profile near your first win of the day bonus timer.

You can only earn 4 Chests per month and I believe one comes available every week. On top of that you can only earn one chest per champion, per season. That doesn't mean you have to get S rank yourself all that means is if you are playing Shaco and your ADC gets S-, S, or S+ you have now earned your Shaco chest and cannot earn another chest while playing Shaco until the end of the season.