[[qanda:topic_unsolved]] QWebEngineView crash in 5.12.3

I moved from QT 5.11.1 to QT 5.12.3. Whenever my application opens QWebEngineView, it crashes in 5.12.3. It works fine in 5.11.1. I also get the below warning in QT 5.12.3.

Release of profile requested but WebEnginePage still not deleted. Expect troubles !

Any idea what can be the cause?