Null check operator used on a null value

[lucian-ma]

The following _CastError was thrown while resolving an image:
Null check operator used on a null value

When the exception was thrown, this was the stack:
#0 ScrollPosition.minScrollExtent (package:flutter/src/widgets/scroll_position.dart:136:49)
#1 _FixedExtentScrollPosition.itemIndex (package:flutter/src/widgets/list_wheel_scroll_view.dart:398:24)
#2 _FixedExtentScrollPosition.copyWith (package:flutter/src/widgets/list_wheel_scroll_view.dart:418:36)
#3 ScrollPosition.recommendDeferredLoading (package:flutter/src/widgets/scroll_position.dart:915:7)
#4 Scrollable.recommendDeferredLoadingForContext (package:flutter/src/widgets/scrollable.dart:295:28)
...
Image provider: ScrollAwareImageProvider()
Image configuration: ImageConfiguration(bundle: PlatformAssetBundle#1863e(), devicePixelRatio: 2.6, locale: en_US, textDirection: TextDirection.ltr, size: Size(30.0, 20.0), platform: android)
Image key: AssetBundleImageKey(bundle: PlatformAssetBundle#1863e(), name: "packages/country_pickers/assets/ky.png", scale: 1.0)

this is my code:

Widget _buildSeletedCountryItem(Country country) => Padding(
padding: EdgeInsets.symmetric(vertical: 20.w),
child: Row(
children: [
CountryPickerUtils.getDefaultFlagImage(country),
SizedBox(width: 8.0),
Text("+${country.phoneCode}",style: TextStyle(fontSize: 36.sp),),
SizedBox(width: 8.0),
Flexible(child: Text(country.name,style: TextStyle(fontSize: 36.sp))),
],
),
);

Widget _buildCountryItem(Country country) {
return Row(
children: [
SizedBox(width: 8.0),
CountryPickerUtils.getDefaultFlagImage(country),
SizedBox(width: 8.0),
Text("+${country.phoneCode}"),
SizedBox(width: 8.0),
Flexible(child: Text(country.name)),
],
);
}

void showCountryModal(BuildContext context){
var tmpCountry = state.selectCountry.value;
showCupertinoModalPopup(
context: context,
builder: (BuildContext context) {
return Container(
child:Column(
mainAxisAlignment: MainAxisAlignment.end,
children:[
Container(
color: Colors.white,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
TextButton(
child: Text("取消"),
onPressed: (){
Get.back();
},
),
TextButton(
child: Text("确定"),
onPressed: (){
state.selectCountry.value = tmpCountry;
state.selectCountry.refresh();
Get.back();
},
),
],
),
),
CountryPickerCupertino(
backgroundColor: Colors.white,
initialCountry: state.selectCountry.value,
itemBuilder:(country)=>_buildCountryItem(country) ,
pickerSheetHeight: 500.0.w,
pickerItemHeight:100.w,
onValuePicked: (Country country) {
tmpCountry = country;
},
// itemFilter: (c) =>
// ['AR', 'DE', 'GB', 'CN'].contains(c.isoCode),
priorityList: [
CountryPickerUtils.getCountryByIsoCode('TR'),
CountryPickerUtils.getCountryByIsoCode('US'),
],
)
]
)
);
}
);
}

[ahmedalrifai]

Hello @lucian-ma did you find solution for this problem?