Navigating from Google Plus/ facebook links posted always crashing in WebCore::HistoryItem::addChildItem

Launch the Qt demo browser, login to google plus/ facebook

Try to click on any links posted on your home page, try to navigate from the launched page.

The browser application always crashing with the following Assertion.

ASSERTION FAILED: !childItemWithTarget(child->target())
history/HistoryItem.cpp(463) : void WebCore::HistoryItem::addChildItem(WTF::PassRefPtr<WebCore::HistoryItem>)
1 0x7f924db3fb8e /home/lakshman/qt510/qtbase/lib/libQt5WebKit.so.5(+0xb59b8e) [0x7f924db3fb8e]
2 0x7f924dc99694 /home/lakshman/qt510/qtbase/lib/libQt5WebKit.so.5(+0xcb3694) [0x7f924dc99694]
3 0x7f924dc9cb4c /home/lakshman/qt510/qtbase/lib/libQt5WebKit.so.5(+0xcb6b4c) [0x7f924dc9cb4c]
4 0x7f924dd8092c /home/lakshman/qt510/qtbase/lib/libQt5WebKit.so.5(+0xd9a92c) [0x7f924dd8092c]
5 0x7f924d896718 /home/lakshman/qt510/qtbase/lib/libQt5WebKit.so.5(+0x8b0718) [0x7f924d896718]
6 0x7f924e630249 /home/lakshman/qt510/qtbase/lib/libQt5WebKit.so.5(+0x164a249) [0x7f924e630249]
7 0x7f91e3586265 [0x7f91e3586265]
Segmentation fault (core dumped)