https://www.noesisengine.com/forums/viewtopic.php?f=3&t=704&p=8774#p8774

<ListBox ItemsSource="{Binding Names}"
SelectedItem="{Binding SelectedName}" />

public string SelectedName { get; set; }
public ObservableCollection<string> Names { get; set; }

Remove SelectedItem from collection for example via adding button with followed code cause hard crash.

if (Names.Contains(SelectedName))
{
Names.Remove(SelectedName);
}

In wpf app all works fine.
If wrap string in class - everything works.