点击取消按钮，报错

[leozhang007]

`
_addressClick() async {
_temp = await CityPickers.showCityPicker(
barrierDismissible: false,
theme: ThemeData(
primarySwatch: buttonColor,
),
context: context,
height: 200,
);

setState(() {
  _address = "${_temp.provinceName}${_temp.cityName}${_temp.areaName}";
});

}
`

[hanxu317317]

你点击取消的时候. _temp还是udnefined. 怎么去取provinceName.