I'm also affected by this bug when using Thunderbird but I've found a
workaround: Unpin Thunderbird (right click on the icon and "Remove from
Favorites"). After that  you can still start Thunderbird manually, it
won't trigger this bug any more when it is just a normal application
(and not a "favorite" application with a fixed place in the Dock).

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1933996

Title:
  Alt-tab stops switching windows [JS ERROR: TypeError: window is null
  _createWindowClone@resource:///org/gnome/shell/ui/altTab.js:29:27]

Status in GNOME Shell:
  Unknown
Status in gnome-shell package in Ubuntu:
  Triaged

Bug description:
  When a new Wayland session is created from a login, Alt-tab works as
  expected to change windows.  After sometime Alt-tab fails to do
  anything (super-tab still works to change applications) and the
  following error is created in syslog:

  gnome-shell[777718]: JS ERROR: TypeError: window is
  
null#012_createWindowClone@resource:///org/gnome/shell/ui/altTab.js:29:27#012_init@resource:///org/gnome/shell/ui/altTab.js:1004:34#012_init@resource:///org/gnome/shell/ui/altTab.js:1045:24#012_init@resource:///org/gnome/shell/ui/altTab.js:568:30#012_startSwitcher@resource:///org/gnome/shell/ui/windowManager.js:2069:24

  The only workaround I have found is to logout and log back in, however
  after some time the error repeats itself.

  Ubuntu 21.04
  gnome-shell: Installed: 3.38.4-1ubuntu3~21.04.1

  ProblemType: Bug
  DistroRelease: Ubuntu 21.04
  Package: gnome-shell 3.38.4-1ubuntu3~21.04.1
  ProcVersionSignature: Ubuntu 5.11.0-22.23-generic 5.11.21
  Uname: Linux 5.11.0-22-generic x86_64
  ApportVersion: 2.20.11-0ubuntu65.1
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Jun 29 10:53:32 2021
  DisplayManager: gdm3
  InstallationDate: Installed on 2020-11-11 (230 days ago)
  InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022)
  RelatedPackageVersions: mutter-common 3.38.4-1ubuntu2
  SourcePackage: gnome-shell
  UpgradeStatus: Upgraded to hirsute on 2021-04-27 (62 days ago)

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