[Gameplay] Yoricks Q-Ghost Bug

I just normaly started an ARAM Game and got Yorick as my Champion. Nothing suspicious until his Q-Ghost didnt die.

The Ghost worked normal, in attacking Minions and Champions but the Problem was, that he was invincible. No Champions or Minion could attack him, because his HP already were on 0. So the Minions started to aggro the ghost behind the enemy teams tower and did not go further.

When I as Yorick died the Ghost kept attacking until I respawned and then followed me through the map until he found a Champion or Minion Wave to attack.

Yoricks Q was still usable and a ghost appeared aswell, without resetting the old one.