@ -298,6 +298,9 @@ class _SettingsState extends State<Settings> {
textFields: [
DialogTextField(
validator: (text) {
if (int.tryParse(text) == null || int.tryParse(text) < 0) {
return L10n.of(context).pleaseEnter4Digits;
}
if (text.length != 4 && text.isNotEmpty) {