This bug was fixed in the package gnome-shell - 3.28.4-0ubuntu18.04.1

---------------
gnome-shell (3.28.4-0ubuntu18.04.1) bionic; urgency=medium

  * New upstream stable release
    - Fix ellipsization in dialog subtitles/bodies (LP: #1809788)
    - dnd: Only handle touch events in wayland (LP: #1817020)
    - windowManager: listen actively to windows being destroyed during WS switch
      (LP: #1812527)
    - Fix unresponsive-app dialog blocking input in other windows (LP: #1740869)
    - Fix regression on missing spread animation (LP: #1827284)
  * d/p/js-fix-invalid-access-errors.patch,
    d/p/js-ui-Choose-some-actors-to-cache-on-the-GPU.patch:
    - Refreshed
  * d/p/switchMonitor-switch-to-next-config-upon-initial-keypress.patch
    - Ensure switch display mode is cyclic (LP: #1772811)
  * debian/control:
    - Depends on mutter 3.28.4-0ubuntu18.04.1
  * d/p/st-widget-Add-missing-g_return_val_if_fail.patch:
    - st-widget: Protect from NULL obj in get_theme_node (LP: #1796606)

 -- Marco Trevisan (Treviño) <ma...@ubuntu.com>  Fri, 10 May 2019
11:43:10 +0100

** Changed in: gnome-shell (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1812527

Title:
  [bionic][regression] gnome-shell crashes with SIGSEGV in
  meta_window_actor_is_destroyed(self=NULL) called from
  _switchWorkspaceDone() [windowManager.js:1787]

Status in GNOME Shell:
  Fix Released
Status in gnome-shell package in Ubuntu:
  Invalid
Status in gnome-shell source package in Bionic:
  Fix Released
Status in gnome-shell source package in Cosmic:
  Invalid
Status in gnome-shell source package in Eoan:
  Invalid

Bug description:
  https://errors.ubuntu.com/problem/cb400a6f83ed57af8bb117cf84d5ed6d7e2ffcee
  https://gitlab.gnome.org/GNOME/gnome-shell/issues/927

  [ Impact ]

  Switching workspace with the Android Emulator running will blink the
  screen as if gnome restarted, if I switch workspace one more time, it
  will completely crash and I will need to log in again.

  [ Test case ]

  Open Android Emulator and switch workspace
  or
  Open Skype, start a test call and switch workspace

  GNOME-Shell should not crash

  [ Regression potential ]

  Very low, we remove windows from Javascript array when they're destroyed.
  A possible regression could be not switching to workspace when selecting a 
window that is in another one.

  ProblemType: BugDistroRelease: Ubuntu 18.04
  Package: gnome-shell 3.28.3-0ubuntu0.18.04.4
  Uname: Linux 4.20.3-acso x86_64
  ApportVersion: 2.20.9-0ubuntu7.5
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Jan 19 20:05:34 2019
  DisplayManager: gdm3
  GsettingsChanges:
   b'org.gnome.shell' b'favorite-apps' redacted by apport
   b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
  InstallationDate: Installed on 2019-01-15 (4 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180725)SourcePackage: gnome-shell
  UpgradeStatus: No upgrade log present (probably fresh install)

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