Stability Matrix Checkpoint Manager crashes #1232

   at StabilityMatrix.Avalonia.ViewModels.CheckpointsPageViewModel.Refresh()
   at AsyncAwaitBestPractices.SafeFireAndForgetExtensions.HandleSafeFireAndForget[TException](Task task, Boolean continueOnCapturedContext, Action`1 onException)
   at System.Threading.Tasks.Task.<>c.<ThrowAsync>b__128_0(Object state)
   at Avalonia.Threading.SendOrPostCallbackDispatcherOperation.InvokeCore()
   at Avalonia.Threading.DispatcherOperation.Execute()
   at Avalonia.Threading.Dispatcher.ExecuteJob(DispatcherOperation job)
   at Avalonia.Threading.Dispatcher.ExecuteJobsCore(Boolean fromExplicitBackgroundProcessingCallback)
   at Avalonia.Threading.Dispatcher.Signaled()
   at Avalonia.Win32.Win32Platform.WndProc(IntPtr hWnd, UInt32 msg, IntPtr wParam, IntPtr lParam)
   at Avalonia.Win32.Interop.UnmanagedMethods.DispatchMessage(MSG& lpmsg)
   at Avalonia.Win32.Win32DispatcherImpl.RunLoop(CancellationToken cancellationToken)
   at Avalonia.Threading.DispatcherFrame.Run(IControlledDispatcherImpl impl)
   at Avalonia.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
   at Avalonia.Threading.Dispatcher.MainLoop(CancellationToken cancellationToken)
   at Avalonia.Controls.ApplicationLifetimes.ClassicDesktopStyleApplicationLifetime.StartCore(String[] args)
   at StabilityMatrix.Avalonia.Program.Main(String[] args)```
```   at lambda_method141(Closure, Object)
   at LiteDB.BsonMapper.SerializeObject(Type type, Object obj, Int32 depth)
   at LiteDB.BsonMapper.Serialize(Type type, Object obj, Int32 depth)
   at LiteDB.BsonMapper.ToDocument(Type type, Object entity)
   at LiteDB.BsonMapper.ToDocument[T](T entity)
   at LiteDB.LiteCollection`1.GetBsonDocs(IEnumerable`1 documents)+MoveNext()
   at LiteDB.Engine.LiteEngine.<>c__DisplayClass7_0.<Insert>b__0(TransactionService transaction)
   at LiteDB.Engine.LiteEngine.AutoTransaction[T](Func`2 fn)
   at LiteDB.SharedEngine.Insert(String collection, IEnumerable`1 docs, BsonAutoId autoId)
   at LiteDB.Async.LiteDatabaseAsync.<>c__DisplayClass37_0`1.<EnqueueAsync>g__Function|0()```


### Version

2.14.0

### What Operating System are you using?

Windows