Those log messages do sound related to the freeze since they repeat so much.
** Summary changed: - Freeze gnome shell and dekstop + gnome-shell freezes and continuously logs JS ERROR: TypeError: null has no properties in _addWindowEffect@resource:///org/gnome/shell/ui/closeDialog.js:74:13 from vfunc_show@resource:///org/gnome/shell/ui/closeDialog.js:145:9 ** Summary changed: - gnome-shell freezes and continuously logs JS ERROR: TypeError: null has no properties in _addWindowEffect@resource:///org/gnome/shell/ui/closeDialog.js:74:13 from vfunc_show@resource:///org/gnome/shell/ui/closeDialog.js:145:9 + gnome-shell freezes and continuously logs "JS ERROR: TypeError: null has no properties" in _addWindowEffect from vfunc_show (both in closeDialog.js) -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1841774 Title: gnome-shell freezes and continuously logs "JS ERROR: TypeError: null has no properties" in _addWindowEffect from vfunc_show (both in closeDialog.js) Status in gnome-shell package in Ubuntu: Incomplete Bug description: I was closing the dialog of the "software and updates" tools (I was checking the repositories and ppa), but the entire desktop went into freeze, no mouse movement, at the click no action, I pressed the keys "ctrl + alt + f3 "and I went into a tty session, from there I recorded the logs via:" journalctl -f> log ", and I restarted. This is one part of the log, but it seems to repeat itself, I have attached a file with a longer log. -- Logs begin at Tue 2019-02-19 00:29:40 CET. -- ago 28 13:41:35 emanuc gnome-shell[2747]: JS ERROR: TypeError: null has no properties _addWindowEffect@resource:///org/gnome/shell/ui/closeDialog.js:74:13 vfunc_show@resource:///org/gnome/shell/ui/closeDialog.js:145:9 ago 28 13:41:35 emanuc gnome-shell[2747]: JS ERROR: TypeError: null has no properties _addWindowEffect@resource:///org/gnome/shell/ui/closeDialog.js:74:13 vfunc_show@resource:///org/gnome/shell/ui/closeDialog.js:145:9 ProblemType: Bug DistroRelease: Ubuntu 19.10 Package: gnome-shell 3.33.91-1ubuntu1 ProcVersionSignature: Ubuntu 5.2.0-13.14-generic 5.2.8 Uname: Linux 5.2.0-13-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.11-0ubuntu7 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Wed Aug 28 14:51:01 2019 DisplayManager: gdm3 InstallationDate: Installed on 2019-02-18 (190 days ago) InstallationMedia: Kubuntu 19.04 "Disco Dingo" - Alpha amd64 (20190130) ProcEnviron: TERM=screen-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=it_IT.UTF-8 SHELL=/bin/bash RelatedPackageVersions: mutter-common 3.33.91-1ubuntu1 SourcePackage: gnome-shell UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1841774/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp