Demobrowser example asserts when opening context menu in debug build

When opening a context menu in debug build of Demobrowser example, the program crashes with following message:
Render process exited with code -2147483645 (crashed)

In debug build reproduce rate is 100%, but in release mode it's not reproducible. The crash does not seem to be reproducible with other webengine examples (i.e. cookiebrowser).

Steps to reproduce:

• Run Demobrowser example (navigate to for example qt.io)
• Wait the page to finish loading
• Click on any white space to
• Right click on any link
• EXPECTED: Context menu is properly shown
• ACTUAL: Program crashes