GetTrainDataでクラッシュ?

[TetsuOtter]

TRViS.MauiProgram.CurrentDomain_UnhandledException() UnhandledException System.Reflection.TargetInvocationException: Arg_TargetInvocationException
 ---> System.ArgumentNullException: ArgumentNull_Generic Arg_ParamName_Name, source
   at System.Linq.Enumerable.Select[TimetableRowData,TimetableRow](IEnumerable`1 , Func`2 )
   at TRViS.IO.LoaderJson.GetTrainData(Int32 trainId)
   at TRViS.DTAC.HakoParts.SimpleView.OnSelectedWorkChanged(Work newWork)
   at TRViS.DTAC.HakoParts.SimpleView..ctor()
   at TRViS.DTAC.Hako.InitializeComponent()
   at TRViS.DTAC.Hako..ctor()
   at TRViS.DTAC.ViewHost.InitializeComponent()
   at TRViS.DTAC.ViewHost..ctor()
   at System.Reflection.MethodBaseInvoker.InterpretedInvoke_Constructor(Object obj, IntPtr* args)
   at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object , BindingFlags )
   Exception_EndOfInnerExceptionStack
   at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object , BindingFlags )
   at System.RuntimeType.CreateInstanceMono(Boolean , Boolean )
   at System.Activator.CreateInstance(Type , Boolean , Boolean )
   at System.Activator.CreateInstance(Type )
   at Microsoft.Maui.Controls.ShellContent.<>c__DisplayClass19_0.<Microsoft.Maui.Controls.IShellContentController.GetOrCreateContent>b__0()
   at Microsoft.Maui.Controls.ElementTemplate.CreateContent()
   at Microsoft.Maui.Controls.Internals.DataTemplateExtensions.CreateContent(DataTemplate self, Object item, BindableObject container)
   at Microsoft.Maui.Controls.ShellContent.Microsoft.Maui.Controls.IShellContentController.GetOrCreateContent()
   at Microsoft.Maui.Controls.Platform.Compatibility.ShellSectionRootRenderer.LoadRenderers()
   at Microsoft.Maui.Controls.Platform.Compatibility.ShellSectionRootRenderer.ViewDidLoad()
--- End of stack trace from previous location ---
   at ObjCRuntime.Runtime.ThrowException(IntPtr )
   at UIKit.UIApplication.UIApplicationMain(Int32 , String[] , IntPtr , IntPtr )
   at UIKit.UIApplication.Main(String[] , Type , Type )
   at TRViS.Program.Main(String[] args)