Public bug reported:

Sometimes certain notifications make the desktop unresponsive for a few
seconds and then gnome-shell crashes and all extensions are reloaded.

I have found an upstream bug with a patch, but it's probably not in the 
Ubuntu's package. I thought of creating an issue in case it is something not 

In my case it happens only with the notifications of gsconnect and maybe 
android studio.
I have reproduced the problem in gsconnect in case it helps.

the error is:
lug 27 19:55:56 ghv gnome-shell[4071]: Object Meta.Background (0x55ce6b4cf300), 
has been already deallocated - impossible to access it. This might be caused by 
the object having been destroyed from C code using something such as destroy(), 
dispose(), or remove() vfuncs

Ubuntu 18.04
Version: 3.28.4-0ubuntu18.04.1

** Affects: gnome-shell (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: crash gnome-shell notifications

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  gnome-shell freezes on notification arrival (fixed upstream)

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