I wouldn't worry about it, you had it in the fridge, plus it was just for over-night.
If you don't feel ill by now, you're fine. The risk would be bacterial infection, but there probably wasn't much time or much material left on the fork to grow sufficient bacteria. In any case, a case of food poisoning hits rather quickly, so you would know by now if you got sick from this event.
The food, BTW, was hummus. No meat, no poultry, no fish.