SwiftUI Dynamic Tab View - swiftui

Question

I trying to display a dynamic page tab view but it keep crash without the error code. The crashed happened when the number of tab view decrease. I cant find what's wrong with my code. So I tested in the sample project but it still the same. In the sample project when I clicked 3 and then clicked other numbers will got no problem, but when I clicked again 3 and scroll the tab view, it will crashed. Here is my sample project.
struct ContentView: View {
#ObservedObject var dataClass = DataClass()
var body: some View {
VStack(){
List{
ForEach(3..<6){ i in
Text("\(i)")
.onTapGesture {
self.dataClass.load(num: i)
}
}
}
if dataClass.data.count != 0{
TabView{
ForEach(dataClass.data.indices, id: \.self){ i in
Text(dataClass.data[i].alp)
}
}.tabViewStyle(PageTabViewStyle())
.padding(.horizontal)
.background(Color.red)
}
}
}
}
class DataClass : ObservableObject {
#Published var data : [DataStruct] = [DataStruct]()
init() {
}
func load(num : Int){
if num == 3 {
data = [DataStruct(num: 1, alp: "a"), DataStruct(num: 2, alp: "b"), DataStruct(num: 3, alp: "c")]
}
if num == 4 {
data = [DataStruct(num: 4, alp: "d"), DataStruct(num: 5, alp: "e"), DataStruct(num: 6, alp: "f"), DataStruct(num: 7, alp: "g")]
}
if num == 5 {
data = [DataStruct(num: 8, alp: "h"), DataStruct(num: 9, alp: "i"), DataStruct(num: 10, alp: "j"), DataStruct(num: 11, alp: "k")]
}
}
}
struct DataStruct {
var num : Int
var alp : String
}