This may be a duplicate or just a very similar issue to RT-37015. In our application an item is added to a list in our ui and then a few lines later it might be updated to a new value. This scenario seems to cause another AIOOB.

1. To reproduce run the following test class and click on the button to add a cell.

The code adds a new item and then right away changes that item which causes the error to occur.

***************************************** Test Class *************************************************
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ListView;
import javafx.scene.control.SelectionMode;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class ListViewTest extends Application {

   @Override public void start(final Stage primaryStage) throws Exception {

      final ListView<Integer> list = new ListView<>();
      list.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);
       
      primaryStage.centerOnScreen();
      primaryStage.setHeight(350);
      primaryStage.setWidth(500);
       
      Button button = new Button("Add Cell");
      button.setOnAction(new EventHandler<ActionEvent>() {
         @Override public void handle(ActionEvent event) {
            Integer newItem = list.getItems().size() + 1;
            list.getItems().add(newItem);
            int idx = list.getItems().size() - 1;
            list.getItems().set(idx, newItem + 1);
         }
      });
      
      primaryStage.setScene(new Scene(new VBox(20, list, button)));

      primaryStage.show();
       
   }

   public static void main(String[] args) throws Exception {
      launch(args);
   }

}