i am click oxygen in your gui and i have a this error

Error while running the event handler: __Cursed-Exp__/scripts/gui.lua:4776: bad argument #1 to 'floor' (number expected, got nil)

thanks you for repair bug to arrow but bug with robots is stayed.Repair robot to collect my cursed hearth and put him storage chest.but they should do transport robots.sorry for my bad english

i am crafted arrows for assemble machine but this arrow (arrows inv ) not have damage. this is bug ? sorry for my bad english