Game crashed

[AirBerliner]

Until now I think 2-3 times. I had to start all the time from the start 01.01.1997
I saved the game with 7  Boeing 777-200 with personal cabin layout (12F, 42J, 207Y) and have no video or audio selected.
The seven planes are scheduled for 11 routes (JED to FRA, MNL, BEY, JNB, PEK, AMS, KUL, VIE, IST, LHR, AUH)

Now I want to recreate the crash and wait until I can get more than 10 planes for JED and within the saving progress the game crashed again. (04.03.1997).

Code:

Game time: 04.03.1997 00:00:00
Version: Version 2.14 Patch B (Alpha)
08.08.2019: 17:36 System.NullReferenceException: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.
  bei TheAirlineProjectV2.Infrastructure.Model.LoadSaveModel.Converters.AirlinerClassesConverter.<>c.<ConvertTo>b__6_0(FacilityOptionType o) in D:\OneDrive\bureaublad\TAP\TAP Code\TheAirlineProjectV2.Infrastructure\Model\LoadSaveModel\Converters\AirlinerClassesConverter.cs:Zeile 148.
  bei System.Linq.Enumerable.WhereSelectListIterator`2.MoveNext()
  bei System.String.Join(String separator, IEnumerable`1 values)
  bei TheAirlineProjectV2.Infrastructure.Model.LoadSaveModel.Converters.AirlinerClassesConverter.ConvertTo(ITypeDescriptorContext context, CultureInfo culture, Object value, Type destinationType) in D:\OneDrive\bureaublad\TAP\TAP Code\TheAirlineProjectV2.Infrastructure\Model\LoadSaveModel\Converters\AirlinerClassesConverter.cs:Zeile 148.
  bei System.ComponentModel.TypeConverter.ConvertTo(Object value, Type destinationType)
  bei SQLiter.SQLiter.getPropertyValue(Object type, PropertyInfo property) in C:\Users\Christian\Documents\Visual Studio 2017\Projects\SQLiter\SQLiter\SQLiter.cs:Zeile 450.
  bei SQLiter.SQLiter.SaveAll[T](IEnumerable`1 data) in C:\Users\Christian\Documents\Visual Studio 2017\Projects\SQLiter\SQLiter\SQLiter.cs:Zeile 175.
  bei TheAirlineProjectV2.Infrastructure.Model.LoadSaveModel.LoadSaveHelpers.SaveGame(SaveFile save) in D:\OneDrive\bureaublad\TAP\TAP Code\TheAirlineProjectV2.Infrastructure\Model\LoadSaveModel\LoadSaveHelpers.cs:Zeile 376.
  bei TheAirlineProjectV2.Infrastructure.Model.LoadSaveModel.LoadSaveObject.saveGame(SaveFile savefile) in D:\OneDrive\bureaublad\TAP\TAP Code\TheAirlineProjectV2.Infrastructure\Model\LoadSaveModel\LoadSaveObject.cs:Zeile 244.
  bei TheAirlineProjectV2.Modules.GameSideMenu.ViewModels.GameSideMenuViewModel.MenuItemClicked(Object o) in D:\OneDrive\bureaublad\TAP\TAP Code\TheAirlineProjectV2.Modules.GameSideMenu\ViewModels\GameSideMenuViewModel.cs:Zeile 224.
  bei Prism.Commands.DelegateCommand`1.Execute(T parameter)
  bei Prism.Commands.DelegateCommand`1.Execute(Object parameter)
  bei Prism.Commands.DelegateCommandBase.System.Windows.Input.ICommand.Execute(Object parameter)
  bei MS.Internal.Commands.CommandHelpers.CriticalExecuteCommandSource(ICommandSource commandSource, Boolean userInitiated)
  bei System.Windows.Documents.Hyperlink.OnClick()
  bei System.Windows.Documents.Hyperlink.DispatchNavigation(Object sender)
  bei System.Windows.Documents.Hyperlink.DoUserInitiatedNavigation(Object sender)
  bei System.Windows.Documents.Hyperlink.OnMouseLeftButtonUp(Object sender, MouseButtonEventArgs e)
  bei System.Windows.Documents.Hyperlink.OnMouseLeftButtonUp(MouseButtonEventArgs e)
  bei System.Windows.UIElement.OnMouseLeftButtonUpThunk(Object sender, MouseButtonEventArgs e)
  bei System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
  bei System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
  bei System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
  bei System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
  bei System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent)
  bei System.Windows.UIElement.OnMouseUpThunk(Object sender, MouseButtonEventArgs e)
  bei System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
  bei System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
  bei System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
  bei System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
  bei System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
  bei System.Windows.ContentElement.RaiseTrustedEvent(RoutedEventArgs args)
  bei System.Windows.Input.InputManager.ProcessStagingArea()
  bei System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
  bei System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
  bei System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
  bei System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
  bei System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
  bei MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
  bei MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
  bei System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
  bei System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
  bei System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
  bei MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
  bei MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
  bei System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
  bei System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
  bei System.Windows.Application.RunDispatcher(Object ignore)
  bei System.Windows.Application.RunInternal(Window window)
  bei System.Windows.Application.Run(Window window)
  bei System.Windows.Application.Run()
  bei TheAirlineProjectV2.App.Main()

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What I notice while posting is, that the fleet side shows me the 12F, 42J, 207Y configuration an the map configuration shows the 8F, 35J, 207Y