App crashes when I try to delete tab

Crashing Tab

struct Item: Identifiable {
    let id = UUID()
    var index: Int
    static var mockData:[Item] {
        return (0...2).map{Item(index: $0)}
    }
}

struct ContentView: View {
    @State var items = Item.mockData
    var body: some View {
        NavigationView {
            TabView() {
                ForEach(items) { item in
                    VStack {
                        Text("Item \(item.index)")
                        Button("Delete") {
                            items.remove(at: indexOf(item: item))
                        }
                    }
                }
            }
            .navigationBarItems(trailing: Button("Add") {
                items.append(Item(index: items.count))
            })
            .tabViewStyle(PageTabViewStyle())
            .indexViewStyle(PageIndexViewStyle(backgroundDisplayMode: .always))
            .navigationTitle("Test Delete")
        }
    }
    func indexOf(item:Item) -> Int {
        items.firstIndex(where: {$0.id == item.id})!
    }
}