Seems it's not an upstream bug:
https://gitlab.gnome.org/GNOME/gnome-shell/issues/1225

** No longer affects: gnome-shell

** Changed in: gnome-shell (Ubuntu)
       Status: New => Triaged

** Summary changed:

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

** Description changed:

- 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.
+ gnome-shell crashes if booted with the monitor 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
+                                       
_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
+                                        
_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
+                                        
_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)

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

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

Status in gnome-shell package in Ubuntu:
  Triaged

Bug description:
  gnome-shell crashes if booted with the monitor 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)

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