Game crashes when the user taps on the potion screen too fast

[cosk]

To reproduce - use a potion either in an Adversary chain, or in a Fortress chamber, then spam-tap to quickly dismiss the potion screen.

Workaround: Don't dismiss the potion screen until you see the "Active" label for wit or exstimulo potions, or the "health is full" message for the healing potion.