Object Shell.GenericContainer has been already finalized. Impossible to get any property from it.
Whether extensions are enabled or disabled, the journal is spammed with warning message and stack traces after switching or opening any applications: https://pastebin.com/89vyeJfL
Arch Linux 4.14.14
Gnome 3.26.2
gjs 1.51.4+4+g7e1187d-1