gnome-shell extension Move_Clock crashes

[Chelmite]

Move_Clock crashes.

<email address hidden> is shipped with Ubuntu 20.10, not a user-installed extension.

Move_Clock does not appear at https://extensions.gnome.org/#, so I'm unable to report the bug directly to the developer.

Journalctl reports:
Mar 16 11:33:44 serval gnome-shell[18204]: JS ERROR: Extension <email address hidden>: TypeError: SessionMode._modes[mode].panel is undefined
                                           enable@/<email address hidden>/extension.js:13:18
                                           _callExtensionEnable@resource:///org/gnome/shell/ui/extensionSystem.js:168:32
                                           _onEnabledExtensionsChanged/<@resource:///org/gnome/shell/ui/extensionSystem.js:496:35
                                           _onEnabledExtensionsChanged@resource:///org/gnome/shell/ui/extensionSystem.js:496:14
                                           _onUserExtensionsEnabledChanged@resource:///org/gnome/shell/ui/extensionSystem.js:485:14

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: gnome-shell 3.38.2-1ubuntu1~20.10.1
ProcVersionSignature: Ubuntu 5.8.0-7642.47~1614007149~20.10~82fb226~dev-generic 5.8.18
Uname: Linux 5.8.0-7642-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu50.5
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Tue Mar 16 11:59:23 2021
DisplayManager: lightdm
InstallationDate: Installed on 2017-11-01 (1231 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
RelatedPackageVersions: mutter-common 3.38.2-1ubuntu1~20.10.1
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to groovy on 2020-11-04 (132 days ago)

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1880245, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.