Destroying or setting a null source on QQuickView leads to a crash

When running the attached program on my Nexus 4 phone, running Ubuntu Touch, I get a crash:

0xb64a7f22 in QQmlBoundSignalExpression::function() const () from /usr/lib/arm-linux-gnueabihf/libQt5Qml.so.5
(gdb) bt
#0 0xb64a7f22 in QQmlBoundSignalExpression::function() const () from /usr/lib/arm-linux-gnueabihf/libQt5Qml.so.5
#1 0xb64a7fc6 in QQmlBoundSignalExpression::sourceLocation() const () from /usr/lib/arm-linux-gnueabihf/libQt5Qml.so.5
#2 0xb64934f4 in QQmlData::destroyed(QObject*) () from /usr/lib/arm-linux-gnueabihf/libQt5Qml.so.5
#3 0xb694ad24 in QObject::~QObject() () from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5
#4 0xb6e9d4d4 in QQuickItem::~QQuickItem() () from /usr/lib/arm-linux-gnueabihf/libQt5Quick.so.5
#5 0xb6ee535e in QQuickMouseArea::~QQuickMouseArea() () from /usr/lib/arm-linux-gnueabihf/libQt5Quick.so.5
#6 0xb6eab05c in ?? () from /usr/lib/arm-linux-gnueabihf/libQt5Quick.so.5
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

This is an ARM device, and the QPA plugin is https://launchpad.net/qtubuntu. I'm not sure if the crash happens because of the QPA plugin, or whether it's ARM related (or just something stupid in my code).
I'd like other people to confirm whether they can reproduce this bug in ARM devices.