In some circumstances, the game can divide by zero when attempting to draw tooltips for unenchanted but enchantable items while on a sorting mode of none.

Originally occurred when shift-clicking a pair of unenchanted books into the crafting table

Minecraft: 1.16.5
BEBooks: 1.2.4

Crash log link

Thank you for the report! Hopefully this will prevent that issue from happening anymore, at least until I refactor the whole mod.
I'm hoping to change everything soon.