Public bug reported:

Gnome shell will crash every time when I turn off monitor or switch the kvm to 
my other system.
Following message was captured in my journalctl log previously:

Nov 10 17:34:31 ubox gnome-shell[1235]: 
meta_monitor_manager_get_logical_monitor_from_number: assertion '(unsigned int) 
number < g_list_length (manager->logical_monitors)' failed
Nov 10 17:34:31 ubox gnome-shell[1235]: 
meta_workspace_get_work_area_for_monitor: assertion 'logical_monitor != NULL' 
failed

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: gnome-shell 3.26.1-0ubuntu5
ProcVersionSignature: Ubuntu 4.13.0-17.20-generic 4.13.8
Uname: Linux 4.13.0-17-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.5
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Wed Nov 22 23:10:24 2017
DisplayManager: gdm3
InstallationDate: Installed on 2017-10-27 (27 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug artful wayland-session

** Attachment added: "Crash file"
   
https://bugs.launchpad.net/bugs/1734044/+attachment/5013275/+files/_usr_bin_gnome-shell.1000.crash

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https://bugs.launchpad.net/bugs/1734044

Title:
  gnome-shell crashes when monitor turned off or switch kvm

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