Null pointer crash in QWaylandInputContext::update when a QWaylandWindow's wl_surface is not initialized

void QWaylandInputContext::update(Qt::InputMethodQueries queries)
{
    qCDebug(qLcQpaInputMethods) << Q_FUNC_INFO << queries;

    if (!QGuiApplication::focusObject() || !textInput())
        return;

    if (mCurrentWindow && mCurrentWindow->handle() && !inputMethodAccepted()) {
        struct ::wl_surface *surface = static_cast<QWaylandWindow *>(mCurrentWindow->handle())->object();
        textInput()->disable(surface);
        mCurrentWindow.clear();
    } else if (!mCurrentWindow && inputMethodAccepted()) {
        QWindow *window = QGuiApplication::focusWindow();
        if (window && window->handle()) {
            struct ::wl_surface *surface = static_cast<QWaylandWindow *>(window->handle())->object();
#ifdef Q_OS_SYLIXOS // this is a bug for qt. 
            if (surface) {
#endif
            textInput()->enable(surface);
            mCurrentWindow = window;
#ifdef Q_OS_SYLIXOS
            }
#endif
        }
    }

    textInput()->updateState(queries, QtWayland::zwp_text_input_v2::update_state_change);
}