Small fixes

frontend/pweb/lib/pages/settings/widgets/base.dart

@@ -81,17 +81,17 @@ class _BaseEditTileBodyState<T> extends State<_BaseEditTileBody<T>> {
       return;
     }
     _stateNotifier.value = EditState.saving;
-    final sms = ScaffoldMessenger.of(context);
+    final scaffoldMessenger = ScaffoldMessenger.of(context);
     final locs = AppLocalizations.of(context)!;
     try {
       await widget.delegate.valueSetter(newValue);
-      sms.showSnackBar(SnackBar(
+      scaffoldMessenger.showSnackBar(SnackBar(
         content: Text(locs.settingsSuccessfullyUpdated),
         duration: const Duration(milliseconds: 1200),
       ));
     } catch (e) {
-      notifyUserOfErrorX(
-        context: context,
+      showErrorSnackBar(
+        scaffoldMessenger: scaffoldMessenger,
         errorSituation: widget.delegate.errorSituation,
         appLocalizations: locs,
         exception: e,
@@ -123,6 +123,7 @@ class _BaseEditTileBodyState<T> extends State<_BaseEditTileBody<T>> {
         );
       },
     );
+    if (!mounted) return;
     if (result != null) await _performSave(result);
   }