Coin Reward

Okay ... i played recently Janna in a few rankeds... and i build obviously the coin ... and all my 6 itemslots were full... i got the 650 bonus gold ... and i didnt get the reward lvl ... because you dont get the level ... you get a flask in your itemslot... and you need to activate it ... sooo if have no free slot ... the reward is just gone? ... because i didnt get the flask later on ... or got the level for free... its my least favorite reward but... no reward is much more frustrating ._.