Public bug reported:

gnome-shell crashes on boot if the monitor is turned off. This leaves me
with just a black screen and flashing cursor when I turn the monitor on.

Apr 29 09:31:02 kab gnome-shell[995]: JS ERROR: TypeError: monitor is null
                                      
_updateContentScale@resource:///org/gnome/shell/ui/magnifier.js:174:9
                                      
Magnifier@resource:///org/gnome/shell/ui/magnifier.js:160:9
                                      
_initializeUI@resource:///org/gnome/shell/ui/main.js:170:17
                                      
start@resource:///org/gnome/shell/ui/main.js:127:5
                                      @<main>:1:31
Apr 29 09:31:02 kab gnome-shell[995]: Execution of main.js threw exception: 
Script <main> threw an exception
Apr 29 09:31:02 kab org.gnome.Shell.desktop[995]: (EE) failed to read Wayland 
events: Connection reset by peer
Apr 29 09:31:03 kab gnome-shell[1076]: JS ERROR: TypeError: monitor is null
                                       
_updateContentScale@resource:///org/gnome/shell/ui/magnifier.js:174:9
                                       
Magnifier@resource:///org/gnome/shell/ui/magnifier.js:160:9
                                       
_initializeUI@resource:///org/gnome/shell/ui/main.js:170:17
                                       
start@resource:///org/gnome/shell/ui/main.js:127:5
                                       @<main>:1:31
Apr 29 09:31:03 kab gnome-shell[1076]: Execution of main.js threw exception: 
Script <main> threw an exception
Apr 29 09:31:03 kab gnome-shell[1094]: JS ERROR: TypeError: monitor is null
                                       
_updateContentScale@resource:///org/gnome/shell/ui/magnifier.js:174:9
                                       
Magnifier@resource:///org/gnome/shell/ui/magnifier.js:160:9
                                       
_initializeUI@resource:///org/gnome/shell/ui/main.js:170:17
                                       
start@resource:///org/gnome/shell/ui/main.js:127:5
                                       @<main>:1:31
Apr 29 09:31:03 kab gnome-shell[1094]: Execution of main.js threw exception: 
Script <main> threw an exception

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: gnome-shell 3.32.0+git20190410-1ubuntu1
ProcVersionSignature: Ubuntu 5.0.0-14.15-generic 5.0.6
Uname: Linux 5.0.0-14-generic x86_64
ApportVersion: 2.20.10-0ubuntu27
Architecture: amd64
Date: Mon Apr 29 09:33:16 2019
DisplayManager: gdm3
InstallationDate: Installed on 2018-12-04 (145 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Alpha amd64 (20181203)
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gnome-shell
     Importance: Unknown
         Status: New

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


** Tags: amd64 apport-bug disco regression-release third-party-packages

** Bug watch added: gitlab.gnome.org/GNOME/gnome-shell/issues #1225
   https://gitlab.gnome.org/GNOME/gnome-shell/issues/1225

** Also affects: gnome-shell via
   https://gitlab.gnome.org/GNOME/gnome-shell/issues/1225
   Importance: Unknown
       Status: Unknown

** Attachment removed: "GsettingsChanges.txt"
   
https://bugs.launchpad.net/gnome-shell/+bug/1826797/+attachment/5259785/+files/GsettingsChanges.txt

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https://bugs.launchpad.net/bugs/1826797

Title:
  [regression] gnome-shell crashes on boot if the monitor is turned off
  ["JS ERROR: TypeError: monitor is null" from
  _updateContentScale@resource:///org/gnome/shell/ui/magnifier.js:174:9]

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