Qt Quick Widgets Example - Grab Framebuffer is susceptible to crash

Description:

If the two starting widgets have been closed, selection "Grab framebuffer" from "File" will crash the example.
Steps to reproduce:

1. Open the Qt Quick Widgets example
2. Close the two starting windows
3. In "File" select "Grab Framebuffer"

Expected behavior:

Selection "Grab framebuffer" should not be crashing the example.
Observed behavior:

If the two starting widgets have been closed, selection "Grab Framebuffer" will crash the example.
Special notes:

It is specifically closing the starting widgets that causes the issue. Creating new ones and closing them will not have this effect.