What happens if my body butter melts?
Do your best to keep your body butter away from heat.
But because life happens, if your body butter happens to melt, it is still usable. You can put it in the fridge to solidfy.
However, if you want it to get back to that creamy whipped texture, after solidified in the fridge, you can take the extra step and use a hand-mixer to whip it until it reaches your desired texture.