Conqueror damage indicator bug

I got fed while playing Darius with the Conqueror rune. After a bit of time my damage through the rune got really high and my friend noticed that my "Damage that would have been mitigated" indicator was actually bugged and showed my damage as -nan(ind). All the other Conquerors in the game were working correctly, so I think it might have something to do with high amounts of damage not being registered correctly, but I haven't tried yet. https://cdn.discordapp.com/attachments/420576960528384011/435193474455699486/unknown.png (Picture posted in the body part since the link one is bugged and loads forever)