Put the summary of the bug you're having here
When I try and smelt anything, the game crashes
*Specifically I expecting to smelt potatoes into baked potatoes when I put them into a furnace and added coal to the fuel slot."
Describe what you thought should happen here

What actually happened was the game crashed when added coal to the fuel slot.
Describe what happened here

Steps to Reproduce:
1. Create a furnace
2. Then select an item to smelt
3. Add coal or some other fuel to the fuel slot