Canvas: setting shadowBlur before calling fillText causes assertion failure

import QtQuick 2.0

Item {
    id: root

    Canvas {
        anchors.fill: parent

        onPaint: {
            var ctx = getContext("2d")
            ctx.shadowBlur = 10;
            ctx.beginPath();
            ctx.fillText("hello", 0, 0);
        }
    }
}

0	__GI_raise	raise.c	64	0x7ffff4f02425	
1	__GI_abort	abort.c	91	0x7ffff4f05b8b	
2	qt_message_fatal	qlogging.cpp	938	0x7ffff592221b	
3	QMessageLogger::fatal	qlogging.cpp	360	0x7ffff591fe8e	
4	qt_assert	qglobal.cpp	1992	0x7ffff591b75c	
5	QImage::constScanLine	qimage.cpp	1555	0x7ffff617e5fe	
6	qt_image_convolute_filter	qquickcontext2d.cpp	286	0x7ffff7a1dadc	
7	qt_image_boxblur	qquickcontext2d.cpp	309	0x7ffff7a1dd1b	
8	makeShadowImage	qquickcontext2dcommandbuffer.cpp	72	0x7ffff7a4b1e4	
9	fillShadowPath	qquickcontext2dcommandbuffer.cpp	112	0x7ffff7a4b768	
10	QQuickContext2DCommandBuffer::replay	qquickcontext2dcommandbuffer.cpp	394	0x7ffff7a4cc3c	
11	QQuickContext2DTexture::paintWithoutTiles	qquickcontext2dtexture.cpp	235	0x7ffff7a48078	
12	QQuickContext2DTexture::paint	qquickcontext2dtexture.cpp	255	0x7ffff7a48188	
13	QQuickContext2DTexture::qt_static_metacall	moc_qquickcontext2dtexture_p.cpp	108	0x7ffff7a8cbf3	
14	QMetaMethod::invoke	qmetaobject.cpp	2154	0x7ffff5b7e9f6	
15	QMetaObject::invokeMethod	qmetaobject.cpp	1463	0x7ffff5b7def7	
16	QMetaObject::invokeMethod	qobjectdefs.h	395	0x7ffff7a1ad93	
17	QQuickContext2D::flush	qquickcontext2d.cpp	3445	0x7ffff7a39f99	
18	QQuickCanvasItem::updatePaintNode	qquickcanvasitem.cpp	701	0x7ffff7a18e3e	
19	QQuickWindowPrivate::updateDirtyNode	qquickwindow.cpp	2371	0x7ffff79141d1	
20	QQuickWindowPrivate::updateDirtyNodes	qquickwindow.cpp	2192	0x7ffff7913135	
21	QQuickWindowPrivate::syncSceneGraph	qquickwindow.cpp	323	0x7ffff790b761	
22	QSGRenderThread::sync	qsgthreadedrenderloop.cpp	529	0x7ffff78e37f7	
23	QSGRenderThread::syncAndRender	qsgthreadedrenderloop.cpp	563	0x7ffff78e3952	
24	QSGRenderThread::run	qsgthreadedrenderloop.cpp	650	0x7ffff78e3d92	
25	QThreadPrivate::start	qthread_unix.cpp	339	0x7ffff59345d1	
26	start_thread	pthread_create.c	308	0x7ffff3c58e9a	
27	clone	clone.S	112	0x7ffff4fbfcbd	
28	??				

const uchar *QImage::constScanLine(int i) const
{
    if (!d)
        return 0;

    Q_ASSERT(i >= 0 && i < height());
    return d->data + i * d->bytes_per_line;
}