Unicorn Blood Sacrifice

I enjoy the game, but it crashes constantly. 

Error

corn/data/creatures.lua:21: attempt to index global 'unlocksIDs' (a nil value)

Traceback

[love "callbacks.lua"]:228: in function 'handler'

corn/data/creatures.lua:21: in function 'onDie'

corn/creature.lua:2536: in function 'after'

toybox/libs/chrono.lua:72: in function 'update'

toybox/entities/Room.lua:550: in function '__step'

toybox/entities/Game.lua:101: in function '__step'

toybox/LGML.lua:378: in function 'update'

[love "callbacks.lua"]:162: in function <[love "callbacks.lua"]:144>

[C]: in function 'xpcall'

a lot of that