Infinite segfault loop on closing event display window

[dennisklein]

OS: Fedora 31
Compiler: GCC 10.2.1
FairRoot: dev @ 71dedec

When closing the event display window by clicking the X in the top right corner, one ends up in an infinite segfault loop:

Root >   
 *** Break *** segmentation violation
Root >
 *** Break *** segmentation violation
Root >
 *** Break *** segmentation violation
Root >
 *** Break *** segmentation violation
Root >
 *** Break *** segmentation violation
Root >
...                                

OTOH, exiting by closing the root session with .q works.

[DanielWielanek]

Hi,
I think I found solution. But honestly I could not find the real source of the problem - I just change code as long as this error wanished.

[ChristianTackeGSI]

Just to link the PR: #1150

[github-actions]

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