App crashes on iOS when trying read the first time. 

 Flutter version 3.3.9 

```
import 'package:json_store/json_store.dart';

JsonStore jsonStore = JsonStore();

Map<String, dynamic>? json = await jsonStore.getItem('counter');
```
Trying to read for the first time on the app crashes it with the snippet above. Without error, disconnected directly from Android Studio.

**Is this package available for iOS?**
