Loader setSource with property binding crashes

import QtQuick 2.11
import QtQuick.Window 2.11
import QtQuick.Controls 2.2

Window {
    id: root
    visible: true
    width: 640
    height: 480

    property bool showFullscreen: false

    Button {
        anchors.centerIn: parent
        onClicked: loader.load()
        text: "Load"
    }

    Loader {
        id: loader
        anchors.fill: parent
        asynchronous: true // crash when setSource sets a property with binding
        function load() {
            if(item === null) {
                  setSource("TestItem.qml",  {"showFullscreen": Qt.binding(function(){return root.showFullscreen })} ); // crash with 5.11.0 and asynchronous=true
                  //setSource("TestItem.qml",  {"showFullscreen": false} ); // works 
            }
        }
    }
}

Rectangle {
    color: "blue"
    property bool showFullscreen: false
}

Exception thrown: read access violation.
this->** v4Function** was nullptr.

Qt5Qmld.dll !QV4::CppStackFrame::lineNumber() Line 786   
Qt5Qmld.dll !QV4::QQmlBindingFunction::currentLocation() Line 1358   
Qt5Qmld.dll !QV4::QObjectWrapper::setProperty(QV4::ExecutionEngine* engine, QObject * object, QQmlPropertyData * property, const QV4::Value& value) Line 466   
Qt5Qmld.dll !QV4::QObjectWrapper::setQmlProperty(QV4::ExecutionEngine* engine, QQmlContextData * qmlContext, QObject * object, QV4::String* name, QV4::QObjectWrapper::RevisionMode revisionMode, const QV4::Value& value) Line 430   
Qt5Qmld.dll !QV4::QObjectWrapper::put(QV4::Managed* m, QV4::String* name, const QV4::Value& value) Line 706   
Qt5Qmld.dll !QV4::Object::put(QV4::String* name, const QV4::Value& v) Line 370 
Qt5Qmld.dll !QQmlComponentPrivate::setInitialProperties(QV4::ExecutionEngine* engine, QV4::QmlContext* qmlContext, const QV4::Value& o, const QV4::Value& v) Line 1256   
Qt5Qmld.dll !QQmlComponentPrivate::initializeObjectWithInitialProperties(QV4::QmlContext* qmlContext, const QV4::Value& valuemap, QObject * toCreate) Line 1454    
Qt5Quickd.dll !QQuickLoaderPrivate::setInitialState(QObject * obj) Line 670  
Qt5Quickd.dll !QQuickLoaderIncubator::setInitialState(QObject * o) Line 635  
Qt5Qmld.dll !QQmlIncubatorPrivate::incubate(QQmlInstantiationInterrupt & i) Line 321 
Qt5Qmld.dll !QQmlIncubationController::incubateFor(int msecs) Line 390   
Qt5Quickd.dll !QQuickWindowIncubationController::incubate() Line 161 
Qt5Quickd.dll !QQuickWindowIncubationController::timerEvent(QTimerEvent * __formal) Line 144 
Qt5Cored.dll !QObject::event(QEvent * e) Line 1233   
Qt5Cored.dll !QCoreApplicationPrivate::notify_helper(QObject * receiver, QEvent * event) Line 1198   
Qt5Cored.dll !doNotify(QObject * receiver, QEvent * event) Line 1138 
Qt5Cored.dll !QCoreApplication::notify(QObject * receiver, QEvent * event) Line 1125 
Qt5Guid.dll !QGuiApplication::notify(QObject * object, QEvent * event) Line 1760 
Qt5Cored.dll !QCoreApplication::notifyInternal2(QObject * receiver, QEvent * event) Line 1048    
Qt5Cored.dll !QCoreApplication::sendEvent(QObject * receiver, QEvent * event) Line 234   
Qt5Cored.dll !QEventDispatcherWin32Private::sendTimerEvent(int timerId) Line 450 
Qt5Cored.dll !QEventDispatcherWin32::event(QEvent * e) Line 1078 
Qt5Cored.dll !QCoreApplicationPrivate::notify_helper(QObject * receiver, QEvent * event) Line 1198   
Qt5Cored.dll !doNotify(QObject * receiver, QEvent * event) Line 1138 
Qt5Cored.dll !QCoreApplication::notify(QObject * receiver, QEvent * event) Line 1125 
Qt5Guid.dll !QGuiApplication::notify(QObject * object, QEvent * event) Line 1760 
Qt5Cored.dll !QCoreApplication::notifyInternal2(QObject * receiver, QEvent * event) Line 1048    
Qt5Cored.dll !QCoreApplication::sendEvent(QObject * receiver, QEvent * event) Line 234   
Qt5Cored.dll !QCoreApplicationPrivate::sendPostedEvents(QObject * receiver, int event_type, QThreadData * data) Line 1745    
Qt5Cored.dll !QEventDispatcherWin32::sendPostedEvents() Line 1085    
qwindowsd.dll !QWindowsGuiEventDispatcher::sendPostedEvents() Line 82    
Qt5Cored.dll !qt_internal_proc(HWND__ * hwnd, unsigned int message, unsigned __int64 wp, __int64 lp) Line 239    
[External Code]
Qt5Cored.dll !QEventDispatcherWin32::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags) Line 630    
qwindowsd.dll !QWindowsGuiEventDispatcher::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags) Line 74   
Qt5Cored.dll !QEventLoop::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags) Line 137   
Qt5Cored.dll !QEventLoop::exec(QFlags<enum QEventLoop::ProcessEventsFlag> flags) Line 214    
Qt5Cored.dll !QCoreApplication::exec() Line 1336 
Qt5Guid.dll !QGuiApplication::exec() Line 1751   
Test_Loader_Property.exe !main(int argc, char** argv) Line 15  
Test_Loader_Property.exe !WinMain(HINSTANCE__ * __formal, HINSTANCE__ * __formal, char* __formal, int __formal) Line 104