QML ConicalGradient causes crash on Android when back button is used

When a ConicalGradient is used in qml on Android, pressing the native Android back button causes the application to crash. This was found in a large project, so I created and attached a small example of this happening, conicalTest.zip.

The crash is a Segmentation fault and the stack trace in the QtMainThread when it crashes is:

1 QQuickEventPoint::grabberItem() const 0xdaf75072
2 QQuickWindowPrivate::removeGrabber(QQuickItem *, bool, bool) 0xdaf8d998
3 QQuickItemPrivate::derefWindow() 0xdaf836ca
4 QQuickItem::setParentItem(QQuickItem *) 0xdaf83a12
5 QQuickItem::~QQuickItem() 0xdaf83c3a
6 QQmlPrivate::QQmlElement<QQuickItem>::~QQmlElement() 0xdaf937d4
7 QQmlPrivate::QQmlElement<QQuickItem>::~QQmlElement() 0xdaf937ec
8 QObjectPrivate::deleteChildren() 0xe48f7fbe
9 QObject::~QObject() 0xe48f87b8
10 QWindow::~QWindow() 0xdb14ea76
11 QQuickWindow::~QQuickWindow() 0xdaf8c272
12 QQuickWindowQmlImpl::~QQuickWindowQmlImpl() 0xf37faea6
13 QQuickApplicationWindow::~QQuickApplicationWindow() 0xf37f945c
14 ?? 0xd88e737a