qmlscene crashed when hover in at a ScatterSeries point

Gang Deng

Dear All,
What I want to do is change a point to red when move mouse into an ScatterSeries point, and recovery the point's when move mouse out of the point. To get it, I define an ScatterSeries with id:selectedPointer to show the red point. When mouse hover into an point, append the point to selectedPointer ; while clear selectedPointer when hover out the point.
Here's a strange problem that qmlscene crashes when hover into a ScatterSeries point. I guess that when the selectedPointer is shown, the points lost focuse and call onHovered with state == false. It will crashes when call selectedPointer.clear() in this state. Is there any ideal of resolve this problem?

import QtQuick 2.12
import QtQuick.Window 2.12
import QtCharts 2.3

Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")
    property var points_X:[1.51,1.57,2.0,2.55]
    property var points_Y: [2.51,3.57,4.0,4.55]
    ChartView{
        id: myChart
        anchors.fill: parent


        legend{
            visible: false
        }

        // line curve
        LineSeries{
            id: line


        }

        ScatterSeries{
            id: points

            onHovered:{

                if (state === true){
                    console.log("hovered in : x:" + point.x + " y:" + point.y)
                    selectedPointer.clear()
                    selectedPointer.append(point.x,point.y)
                }else{
                    console.log("hovered out : x:" + point.x + " y:" + point.y)
                    selectedPointer.clear()

                }

            }

            onPressed:  {

                selectedPointer.clear()
                selectedPointer.append(point.x,point.y)
            }

        }

        ScatterSeries{
            id: selectedPointer
            color: "red"
        }

        Component.onCompleted:  {
            var index
            console.log("points_X:"+ points_X.length)
            for(index = 0;index < points_X.length;index++){
                line.append(points_X[index],points_Y[index])
                points.append(points_X[index],points_Y[index])
                console.log("append : "+ points_X[index],points_Y[index])

            }

            selectedPointer.append(points_X[1],points_Y[1])

            myChart.axisX().max = 3
            myChart.axisY().max = 5
        }
    }
}