Regression: Gnome Shell crashes when plugging or unplugging external monitor

[gpothier]

A recent update (less than two weeks) in 17.10 introduced a bug where plugging or unplugging an external monitor immediately terminates Gnome Shell and brings back the login screen.
I think these are the relevant log entries:

Oct 13 11:07:39 tadzim3 org.gnome.Shell.desktop[2576]: **
Oct 13 11:07:39 tadzim3 org.gnome.Shell.desktop[2576]: mutter:ERROR:backends/meta-monitor-manager.c:2267:meta_monitor_manager_get_logical_monitor_from_number: assertion failed: ((
unsigned int) number < g_list_length (manager->logical_monitors))
Oct 13 11:07:39 tadzim3 owncloud[2934]: Error reading events from display: Broken pipe
Oct 13 11:07:39 tadzim3 evolution-alarm[2925]: Error reading events from display: Broken pipe
Oct 13 11:07:39 tadzim3 org.gnome.Shell.desktop[2576]: (EE)
Oct 13 11:07:39 tadzim3 org.gnome.Shell.desktop[2576]: Fatal server error:
Oct 13 11:07:39 tadzim3 org.gnome.Shell.desktop[2576]: (EE) failed to read Wayland events: Broken pipe
Oct 13 11:07:39 tadzim3 org.gnome.Shell.desktop[2576]: (EE)
Oct 13 11:07:39 tadzim3 gnome-session-binary[2526]: Unrecoverable failure in required component org.gnome.Shell.desktop
Oct 13 11:07:39 tadzim3 gnome-session[2526]: gnome-session-binary[2526]: WARNING: Application 'org.gnome.Shell.desktop' killed by signal 6
Oct 13 11:07:39 tadzim3 gnome-session-binary[2526]: WARNING: Application 'org.gnome.Shell.desktop' killed by signal 6

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: gnome-shell 3.26.1-0ubuntu2
ProcVersionSignature: Ubuntu 4.13.0-15.16-generic 4.13.4
Uname: Linux 4.13.0-15-generic x86_64
ApportVersion: 2.20.7-0ubuntu3
Architecture: amd64
CurrentDesktop: GNOME
Date: Fri Oct 13 11:08:24 2017
DisplayManager: gdm3
InstallationDate: Installed on 2015-01-23 (993 days ago)
InstallationMedia: Ubuntu-GNOME 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to artful on 2017-06-15 (120 days ago)