Zoe w level up text bug

I came across this in one for all with Zoe. You can recreate it by.

1.Going to lvl 10 with one level up skill point remaining.

2.Having Heal as your W (or as far as I know any spell) on W.

3.Then hovering mouse over level up button to which the text reads.

Spell Not Found: AbilityUpgradeButton Tooltip Not Found