Qt5WebEngineCore crashed at application close, exit(stdlib)

Qt5WebEngineCore.dll throws Unhandle fail fast exception when exit(EXIT_SUCCESS) from Stdlib is called.

We implemented a web browser with QtWebEngine tools few months ago, but we have recently update Qt version, since then, it gives this error at close of the application.

Is there a solution to solve this issue? Or is it solved in newer Qt version?

Regards

Update:

Issue solved successfully. The problem was that we have create Browser Widget within a smart pointer instead of raw pointer.