Public bug reported:

I get the following Messages with journalctl /usr/bin/gnome-shell -f -o cat
This error message repeats constantly:
Window manager warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a 
timestamp of 0 for 0x7e00007 (GNOME Twea)
Object Meta.Background (0x55b934b879a0), has been already deallocated - 
impossible to access it. This might be caused by the object having been 
destroyed from C code using something such as destroy(), dispose(), or remove() 
vfuncs
== Stack trace for context 0x55b92e73b4d0 ==
#0 0x55b92edb2128 i   resource:///org/gnome/shell/ui/background.js:718 
(0x7f490c00f4d8 @ 22)
#1 0x55b92edb20a0 i   resource:///org/gnome/shell/ui/tweener.js:112 
(0x7f48cc3c8e68 @ 37)
#2 0x7ffd4ab0a690 b   resource:///org/gnome/gjs/modules/tweener/tweener.js:208 
(0x7f48cc3d2b38 @ 54)
#3 0x7ffd4ab0a7e0 b   resource:///org/gnome/gjs/modules/tweener/tweener.js:337 
(0x7f48cc3d2bc0 @ 1626)
#4 0x7ffd4ab0a890 b   resource:///org/gnome/gjs/modules/tweener/tweener.js:350 
(0x7f48cc3d2c48 @ 100)
#5 0x7ffd4ab0a920 b   resource:///org/gnome/gjs/modules/tweener/tweener.js:365 
(0x7f48cc3d2cd0 @ 10)
#6 0x7ffd4ab0aa10 b   resource:///org/gnome/gjs/modules/signals.js:128 
(0x7f48cc3d2230 @ 386)
#7 0x7ffd4ab0aac0 b   resource:///org/gnome/shell/ui/tweener.js:244 
(0x7f48cc3cf808 @ 159)
#8 0x7ffd4ab0ab20 I   resource:///org/gnome/gjs/modules/_legacy.js:82 
(0x7f48cc3b5de0 @ 71)
#9 0x7ffd4ab0abc0 b   resource:///org/gnome/shell/ui/tweener.js:219 
(0x7f48cc3cf780 @ 15)
g_object_run_dispose: assertion 'G_IS_OBJECT (object)' failed
Object Meta.Background (0x55b934ab7860), has been already deallocated - 
impossible to access it. This might be caused by the object having been 
destroyed from C code using something such as destroy(), dispose(), or remove() 
vfuncs
== Stack trace for context 0x55b92e73b4d0 ==
#0 0x55b92edb2128 i   resource:///org/gnome/shell/ui/background.js:718 
(0x7f490c00f4d8 @ 22)
#1 0x55b92edb20a0 i   resource:///org/gnome/shell/ui/tweener.js:112 
(0x7f48cc3c8e68 @ 37)
#2 0x7ffd4ab0a690 I   resource:///org/gnome/gjs/modules/tweener/tweener.js:208 
(0x7f48cc3d2b38 @ 54)
#3 0x7ffd4ab0a7e0 b   resource:///org/gnome/gjs/modules/tweener/tweener.js:337 
(0x7f48cc3d2bc0 @ 1626)
#4 0x7ffd4ab0a890 b   resource:///org/gnome/gjs/modules/tweener/tweener.js:350 
(0x7f48cc3d2c48 @ 100)
#5 0x7ffd4ab0a920 b   resource:///org/gnome/gjs/modules/tweener/tweener.js:365 
(0x7f48cc3d2cd0 @ 10)
#6 0x7ffd4ab0aa10 b   resource:///org/gnome/gjs/modules/signals.js:128 
(0x7f48cc3d2230 @ 386)
#7 0x7ffd4ab0aac0 b   resource:///org/gnome/shell/ui/tweener.js:244 
(0x7f48cc3cf808 @ 159)
#8 0x7ffd4ab0ab20 I   resource:///org/gnome/gjs/modules/_legacy.js:82 
(0x7f48cc3b5de0 @ 71)
#9 0x7ffd4ab0abc0 b   resource:///org/gnome/shell/ui/tweener.js:219 
(0x7f48cc3cf780 @ 15)
g_object_run_dispose: assertion 'G_IS_OBJECT (object)' failed
Obj

Ubuntu 18.04.4 LTS

gjs:
  Installed: 1.52.5-0ubuntu18.04.1

This is the only errors in gnome shell and sometimes my computer freezes
and I have to restart the computer because keybord does not work.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gjs 1.52.5-0ubuntu18.04.1
Uname: Linux 5.4.10-acso x86_64
ApportVersion: 2.20.9-0ubuntu7.11
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Feb 27 22:12:33 2020
SourcePackage: gjs
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gjs (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1865102

Title:
  gjs is spamming error messages for tweener

Status in gjs package in Ubuntu:
  New

Bug description:
  I get the following Messages with journalctl /usr/bin/gnome-shell -f -o cat
  This error message repeats constantly:
  Window manager warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a 
timestamp of 0 for 0x7e00007 (GNOME Twea)
  Object Meta.Background (0x55b934b879a0), has been already deallocated - 
impossible to access it. This might be caused by the object having been 
destroyed from C code using something such as destroy(), dispose(), or remove() 
vfuncs
  == Stack trace for context 0x55b92e73b4d0 ==
  #0 0x55b92edb2128 i   resource:///org/gnome/shell/ui/background.js:718 
(0x7f490c00f4d8 @ 22)
  #1 0x55b92edb20a0 i   resource:///org/gnome/shell/ui/tweener.js:112 
(0x7f48cc3c8e68 @ 37)
  #2 0x7ffd4ab0a690 b   
resource:///org/gnome/gjs/modules/tweener/tweener.js:208 (0x7f48cc3d2b38 @ 54)
  #3 0x7ffd4ab0a7e0 b   
resource:///org/gnome/gjs/modules/tweener/tweener.js:337 (0x7f48cc3d2bc0 @ 1626)
  #4 0x7ffd4ab0a890 b   
resource:///org/gnome/gjs/modules/tweener/tweener.js:350 (0x7f48cc3d2c48 @ 100)
  #5 0x7ffd4ab0a920 b   
resource:///org/gnome/gjs/modules/tweener/tweener.js:365 (0x7f48cc3d2cd0 @ 10)
  #6 0x7ffd4ab0aa10 b   resource:///org/gnome/gjs/modules/signals.js:128 
(0x7f48cc3d2230 @ 386)
  #7 0x7ffd4ab0aac0 b   resource:///org/gnome/shell/ui/tweener.js:244 
(0x7f48cc3cf808 @ 159)
  #8 0x7ffd4ab0ab20 I   resource:///org/gnome/gjs/modules/_legacy.js:82 
(0x7f48cc3b5de0 @ 71)
  #9 0x7ffd4ab0abc0 b   resource:///org/gnome/shell/ui/tweener.js:219 
(0x7f48cc3cf780 @ 15)
  g_object_run_dispose: assertion 'G_IS_OBJECT (object)' failed
  Object Meta.Background (0x55b934ab7860), has been already deallocated - 
impossible to access it. This might be caused by the object having been 
destroyed from C code using something such as destroy(), dispose(), or remove() 
vfuncs
  == Stack trace for context 0x55b92e73b4d0 ==
  #0 0x55b92edb2128 i   resource:///org/gnome/shell/ui/background.js:718 
(0x7f490c00f4d8 @ 22)
  #1 0x55b92edb20a0 i   resource:///org/gnome/shell/ui/tweener.js:112 
(0x7f48cc3c8e68 @ 37)
  #2 0x7ffd4ab0a690 I   
resource:///org/gnome/gjs/modules/tweener/tweener.js:208 (0x7f48cc3d2b38 @ 54)
  #3 0x7ffd4ab0a7e0 b   
resource:///org/gnome/gjs/modules/tweener/tweener.js:337 (0x7f48cc3d2bc0 @ 1626)
  #4 0x7ffd4ab0a890 b   
resource:///org/gnome/gjs/modules/tweener/tweener.js:350 (0x7f48cc3d2c48 @ 100)
  #5 0x7ffd4ab0a920 b   
resource:///org/gnome/gjs/modules/tweener/tweener.js:365 (0x7f48cc3d2cd0 @ 10)
  #6 0x7ffd4ab0aa10 b   resource:///org/gnome/gjs/modules/signals.js:128 
(0x7f48cc3d2230 @ 386)
  #7 0x7ffd4ab0aac0 b   resource:///org/gnome/shell/ui/tweener.js:244 
(0x7f48cc3cf808 @ 159)
  #8 0x7ffd4ab0ab20 I   resource:///org/gnome/gjs/modules/_legacy.js:82 
(0x7f48cc3b5de0 @ 71)
  #9 0x7ffd4ab0abc0 b   resource:///org/gnome/shell/ui/tweener.js:219 
(0x7f48cc3cf780 @ 15)
  g_object_run_dispose: assertion 'G_IS_OBJECT (object)' failed
  Obj

  Ubuntu 18.04.4 LTS

  gjs:
    Installed: 1.52.5-0ubuntu18.04.1

  This is the only errors in gnome shell and sometimes my computer
  freezes and I have to restart the computer because keybord does not
  work.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: gjs 1.52.5-0ubuntu18.04.1
  Uname: Linux 5.4.10-acso x86_64
  ApportVersion: 2.20.9-0ubuntu7.11
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Feb 27 22:12:33 2020
  SourcePackage: gjs
  UpgradeStatus: No upgrade log present (probably fresh install)

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