diff --git a/lib/views/settings.dart b/lib/views/settings.dart
index e6d41085..f8d69f3e 100644
--- a/lib/views/settings.dart
+++ b/lib/views/settings.dart
@@ -315,7 +315,7 @@ class _SettingsState extends State<Settings> {
       textFields: [
         DialogTextField(
           validator: (text) {
-            if (text.length == 0 || (text.length == 4 && int.tryParse(text) >= 0)) {
+            if (text.isEmpty || (text.length == 4 && int.tryParse(text) >= 0)) {
               return null;
             }
             return L10n.of(context).pleaseEnter4Digits;