Flutter 中的 SharedPreferences 错误

我正在使用shared_preferences我的 Flutter 应用程序中的插件。从某个时刻开始（可能是在 Flutter 升级之后），它开始抛出异常：

E/flutter (27778): [ERROR:topaz/lib/tonic/logging/dart_error.cc(16)] Unhandled exception:
E/flutter (27778): type '_InternalLinkedHashMap' is not a subtype of type 'Map<String, Object>' where
E/flutter (27778):   _InternalLinkedHashMap is from dart:collection
E/flutter (27778):   Map is from dart:core
E/flutter (27778):   String is from dart:core
E/flutter (27778):   Object is from dart:core
E/flutter (27778): 
E/flutter (27778): #0      SharedPreferences.getInstance (package:shared_preferences/shared_preferences.dart)
E/flutter (27778): <asynchronous suspension>
E/flutter (27778): #1      loadFirstUse (**path**/lib/main.dart:29:53)
E/flutter (27778): <asynchronous suspension>
E/flutter (27778): #2      main (**path**/lib/main.dart:17:9)
E/flutter (27778): <asynchronous suspension>
E/flutter (27778): #3      _startIsolate.<anonymous closure> (dart:isolate/runtime/libisolate_patch.dart:279:19)
E/flutter (27778): #4      _RawReceivePortImpl._handleMessage (dart:isolate/runtime/libisolate_patch.dart:165:12)

当我简单地尝试创建 SharedPreferences 实例时就会发生这种情况：

SharedPreferences prefs = await SharedPreferences.getInstance();

我试图找到问题的根源，但找不到。感谢您的任何帮助。

编辑：我正在使用shared_preferences: "^0.4.0"

我使用以下解决方法解决了这个问题：

Future<SharedPreferences> prefs = SharedPreferences.getInstance();
prefs.then(
  (pref)
  {
    //call functions like pref.getInt(), etc. here
  }
);