QGraphicsScene::items() Segmentation Fault

[pmwalk]

I cannot find a way to get the item lists from a QGraphicsScene. When trying the items() method, the program always crashes with a segfault.

Here is the bit of code where the problem occurs:

void MainWindow::updateMapView() {
	scene->addRect(QRectF(0, 0, 10, 10), scenePen, sceneBrush);
	QList<QGraphicsItem*> items = scene->items();
	for (int i = 0; i < items.size(); i++) {
		scene->addItem(items[i]);
	}
	ui.map_view->setScene(scene);
}

void MainWindow::updateMapView() {
	scene->addRect(QRectF(0, 0, 10, 10), scenePen, sceneBrush);
	QList<QGraphicsItem*> items = scene->items();
	for (int i = 0; i < items.size(); i++) {
		scene->addItem(items[i]);
	}
	ui.map_view->setScene(scene);
}

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If I remove the middle four lines (and just add the QRectF and set the scene), the code runs fine and the rectangle is displayed. Once I try and get the items, I get the fault.

Any hints? I'm at a bit of a loss. Thanks.

Edit: This also occurs for some other functions too, including QGraphicsScene::width() and height(). Not addItem(), or any of the other add functions though.