QML binding crash only on runtime - QSharedPointer crash

I would like to create a range age selector. To do this, a control to select a number is created:

SpinnerInt.qml

Code:

---

import QtQuick 2.0
 
ListView {
    id: root
    property alias maxString: textSize.text
    property int shadowHeight
    property int minValue: 0
    onMinValueChanged: {
        var lastValue = value
        modelValues = maxValue - minValue + 1
        if (lastValue > value) {
            currentIndex = lastValue - minValue
        }
    }
    property int maxValue: 0
    onMaxValueChanged: {
        modelValues = maxValue - minValue + 1
    }
    property int value: 0
    function setValue(newValue) {
        currentIndex = newValue - minValue
    }
    property int iniValue: 0
    Text {
        id: textSize
        visible: false
        font.pixelSize: 24
    }
 
    onCurrentIndexChanged: {
        value = currentIndex + minValue
    }
 
    property int modelValues
    highlightRangeMode: ListView.StrictlyEnforceRange
    width: textSize.width
    height: textSize.height + (2 * shadowHeight)
    preferredHighlightBegin: shadowHeight
    preferredHighlightEnd: height - shadowHeight
    clip: true
    model: modelValues
    delegate: Text {
        color: currentIndex == index ? "black" : "lightgray";
        text: index + minValue
        font.pixelSize: 24
        anchors.horizontalCenter: parent.horizontalCenter
    }
    Component.onCompleted: {
        var i = iniValue - minValue
        if (i >= 0) {
            currentIndex = i
        }
    }
}

---

The main.qml looks like this:

Code:

---

import QtQuick 2.5
import QtQuick.Controls 1.4
 
ApplicationWindow {
    visible: true
    width: 640
    height: 480
    Row {
        spacing: 20
        SpinnerInt {
            id: ageMin
            shadowHeight: 20
            maxString: "MM"
            minValue: 15
            maxValue: 99
            iniValue: 20
        }
        SpinnerInt {
            id: ageMax
            shadowHeight: 20
            maxString: "MM"
            minValue: ageMin.value
            maxValue: 99
            iniValue: 20
        }
    }
}

---

Note that the property minValue on ageMax is binding with ageMin.value.

If is tested with qmlscene, all works fine, but if runs the program, it crash in qsharedpointer.cpp.

Why is crashing only on runtime? How can I fix it?