Crash: Setting qobject property with QVariant() will cause crash

1) A test class with Q_PROPERTY in QSharedPointer<int>
2) Setting the property with invalid QVariant will cause crash.

TestCode attached.

(test.h)
typedef QSharedPointer<int> IntPtr2;
Q_DECLARE_METATYPE(IntPtr2)

class CTest : public QObject
{
    Q_OBJECT
public:
    Q_PROPERTY(IntPtr2 spine2 READ GetSpine2 WRITE SetSpine2)

    IntPtr2 GetSpine2() const
    {
        return m_Spine2;
    }
    void SetSpine2(IntPtr2 p_Spine2)
    {
        m_Spine2 = p_Spine2;
    }

 private:
    IntPtr2 m_Spine2;
};

main.cpp

int main(int argc, char *argv[])
{
    qRegisterMetaType<IntPtr2>();

    // QVariant var = qVariantFromValue(IntPtr2()); // works
    QVariant var;

    CTest test;
    test.setProperty("spine2", var);    // crash
}

crash log:
0 bool QBasicAtomicOps<4>::ref<int>(int&) qatomic_x86.h 184 0x100002c00
1 QBasicAtomicInteger<int>::ref() qbasicatomic.h 135 0x100002be5
2 QSharedPointer<int>::ref() const qsharedpointer_impl.h 502 0x100002ba0
3 QSharedPointer qsharedpointer_impl.h 322 0x100002b75
4 QSharedPointer qsharedpointer_impl.h 322 0x100002add
5 CTest::qt_metacall(QMetaObject::Call, int, void**) moc_CTest.cpp 108 0x100003379
6 QMetaProperty::write(QObject*, QVariant const&) const QMetaProperty::write(QObject*, QVariant const&) const 0x1002512c5
7 QObject::setProperty(char const*, QVariant const&) QObject::setProperty(char const*, QVariant const&) 0x10027983f
8 main main.cpp 12 0x1000020c9
9 start start 0x100002074