Markdium-React race condition bug

Markdium-JSX.jsx

let _previousKey;

function Pets() {
  //... 

  useEffect(() => {
    _previousKey = pets.selectedPet;
    if (pets.selectedPet) {
      dispatch({ type: "FETCH_PET" });
      getPet(pets.selectedPet).then(data => {
        if (_previousKey === pets.selectedPet) {
          dispatch({ type: "FETCH_PET_SUCCESS", payload: data });
        }
      });
    } else {
      dispatch({ type: "RESET" });
    }
  }, [pets.selectedPet]);

  return (...);
}