Adding a map after the game is running causes the program to crash

[xhcminecraft]

Program Crash Log

System.InvalidOperationException: Sequence contains no elements
at System.Linq.ThrowHelper.ThrowNoElementsException()
at ImageMap4.JavaInventory.AddItems(IEnumerable1 items) at ImageMap4.DisplayJavaInventory.AddItems(IEnumerable1 items)
at ImageMap4.MainViewModel.<.ctor>b__51_1()
at ImageMap4.RelayCommand.Execute(Object parameter)
at MS.Internal.Commands.CommandHelpers.CriticalExecuteCommandSource(ICommandSource commandSource, Boolean userInitiated)
at System.Windows.Controls.Primitives.ButtonBase.OnClick()
at System.Windows.Controls.Button.OnClick()
at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
at System.Windows.UIElement.OnMouseLeftButtonUpThunk(Object sender, MouseButtonEventArgs e)
at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent)
at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
at System.Windows.Input.InputManager.ProcessStagingArea()
at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

Server Log

[11:51:33] [Server thread/WARN]: Failed to parse map banner: 'Not a list: null'
[11:51:33] [Server thread/WARN]: Failed to parse map banner: 'Not a list: null'
[11:51:33] [Server thread/WARN]: Failed to parse map banner: 'Not a list: null'
[11:51:33] [Server thread/WARN]: Failed to parse map banner: 'Not a list: null'
[11:51:33] [Server thread/WARN]: Failed to parse map banner: 'Not a list: null'
[11:51:33] [Server thread/WARN]: Failed to parse map banner: 'Not a list: null'
[11:51:33] [Server thread/WARN]: Failed to parse map banner: 'Not a list: null'
[11:51:33] [Server thread/WARN]: Failed to parse map banner: 'Not a list: null'
[11:51:33] [Server thread/WARN]: Failed to parse map banner: 'Not a list: null'

I am a live game blogger.Please fix it fast.