REG 5.13->5.14: Segfault upon close and then show

Under some circunstamces a call to makeCurrent inside a QGLWidget widget segfaults the program

I Think this might be related to bug https://bugreports.qt.io/browse/QTBUG-82374 which was closed as invalid and seems to have left unchecked ( i commented on that bug)

I attach a very small program that exhibits the problem.

Steps to reproduce with provided example:

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1.- Open Program

2.- Click on "show" button

3.- Close the window that will open

4.- Click on "show" button again

5.- Segfault