App Crash on Restart with following exception Unhandled Exception: type 'Null' is not a subtype of type

I have followed the sample code properly. While the app is running it works fine. It saves and retrieves data. But when I restart the application it crashes with an exception.

**
if (!kIsWeb) {
Directory dir = await getApplicationDocumentsDirectory();
Hive.init(dir.path);
}
//await Hive.initFlutter();
Hive.registerAdapter(CompanyAdapter());
Hive.registerAdapter(MediaAdapter());
Hive.registerAdapter(KeyWordAdapter());

if (!Hive.isBoxOpen('storyBox')) {
await Hive.openBox<Map<String, dynamic>>(
'storyBox',
);
}

**

[VERBOSE-2:dart_vm_initializer.cc(41)] Unhandled Exception: type 'Null' is not a subtype of type 'Company'
#0      CompanyAdapter.read (package:presseportal/domain/news/story_adapter.dart:47:19)
#1      BinaryReaderImpl.read (package:hive/src/binary/binary_reader_impl.dart:328:33)
#2      BinaryReaderImpl.readMap (package:hive/src/binary/binary_reader_impl.dart:212:21)
#3      BinaryReaderImpl.read (package:hive/src/binary/binary_reader_impl.dart:319:16)
#4      BinaryReaderImpl.readFrame (package:hive/src/binary/binary_reader_impl.dart:276:26)
#5      FrameHelper.framesFromBytes (package:hive/src/binary/frame_helper.dart:21:32)
#6      FrameIoHelper.framesFromFile (package:hive/src/io/frame_io_helper.dart:42:12)
<asynchronous suspension>
#7      StorageBackendVm.initialize (package:hive/src/backend/vm/storage_backend_vm.dart:86:11)
<asynchronous suspension>
#8      HiveImpl._openBox (package:hive/src/hive_impl.dart:105:9)
<asynchronous suspension>

Version

• Platform: iOS, iPhone Pro Max Device and Simulator
• Flutter version: Flutter (Channel stable, 3.7.1, on macOS 13.2 22D49 darwin-arm64, locale en-DE)

Start with story_adapter.dart at line 47, then trace how Hive.openBox<Map<String, dynamic>> reads persisted data through CompanyAdapter.read after an application restart. Reproduce on the listed iOS simulator or device using the supplied initialization and registration code; done means the stored box reopens without the reported Null/Company exception.