It appears I can reproduce the message by changing wallpapers.
Maybe your system is set to automatically change wallpaper every 10
minutes or so, so you will keep getting the message.
** Changed in: gnome-shell (Ubuntu)
Status: Incomplete => New
** Changed in: gnome-shell (Ubuntu)
Importance: Undecided => Low
** Changed in: gnome-shell (Ubuntu)
Status: New => Triaged
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https://bugs.launchpad.net/bugs/1787822
Title:
gnome-shell[2503]: Object Meta.Background (0x561c9af53600), has been
already deallocated - impossible to access to it
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