nm-applet[3607]: gtk_widget_destroy: assertion 'GTK_IS_WIDGET (widget)' failed

[Achim Behrens]

running 18.04 this message is spamming into syslog:
> nm-applet[3607]: gtk_widget_destroy: assertion 'GTK_IS_WIDGET (widget)' failed

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: network-manager 1.8.4-1ubuntu4
ProcVersionSignature: Ubuntu 4.15.0-10.11-generic 4.15.3
Uname: Linux 4.15.0-10-generic x86_64
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
CurrentDesktop: Unity:Unity7:ubuntu
Date: Mon Feb 26 01:16:49 2018
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2013-09-28 (1611 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Beta amd64 (20130925.1)
IpRoute:
 default via 192.168.1.1 dev wlan1 proto static metric 600
 169.254.0.0/16 dev wlan1 scope link metric 1000
 192.168.1.0/24 dev wlan1 proto kernel scope link src 192.168.1.34 metric 600
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=false
SourcePackage: network-manager
UpgradeStatus: Upgraded to bionic on 2018-01-12 (44 days ago)
modified.conffile..etc.polkit-1.localauthority.50-local.d.org.freedesktop.NetworkManager.pkla: [deleted]
nmcli-dev:
 DEVICE TYPE STATE DBUS-PATH CONNECTION CON-UUID CON-PATH
 wlan1 wifi connected /org/freedesktop/NetworkManager/Devices/3 k2l 7df024b1-9b89-4f95-84c1-03188bb67f77 /org/freedesktop/NetworkManager/ActiveConnection/1
 EC:88:92:02:17:7D bt disconnected /org/freedesktop/NetworkManager/Devices/4 -- -- --
 eth1 ethernet unavailable /org/freedesktop/NetworkManager/Devices/2 -- -- --
 lo loopback unmanaged /org/freedesktop/NetworkManager/Devices/1 -- -- --
nmcli-nm:
 RUNNING VERSION STATE STARTUP CONNECTIVITY NETWORKING WIFI-HW WIFI WWAN-HW WWAN
 running 1.8.4 connected started full enabled enabled enabled enabled disabled

[Sebastien Bacher (seb128)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please try to obtain a backtrace following the instructions at http://wiki.ubuntu.com/DebuggingProgramCrash and upload the backtrace (as an attachment) to the bug report. This will greatly help us in tracking down your problem.

[Andrew (andrewkvalheim)]

Is this the same as bug 1755305?

[Launchpad Janitor (janitor)]

[Expired for network-manager (Ubuntu) because there has been no activity for 60 days.]

[Cyrille37 (cyrille37)]

Hi,

This bug continue, on Ubuntu 18.04.5 LTS + MATE 1.20.1.

In .xsession-errors :

(nm-applet:2221): Gtk-CRITICAL **: 12:09:29.609: gtk_widget_destroy: assertion 'GTK_IS_WIDGET (widget)' failed
(nm-applet:2221): Gtk-CRITICAL **: 12:09:29.609: gtk_widget_destroy: assertion 'GTK_IS_WIDGET (widget)' failed
(nm-applet:2221): Gtk-WARNING **: 12:09:29.611: Can't set a parent on widget which has a parent
(nm-applet:2221): Gtk-CRITICAL **: 12:09:29.614: gtk_widget_destroy: assertion 'GTK_IS_WIDGET (widget)' failed
(nm-applet:2221): Gtk-CRITICAL **: 12:09:29.614: gtk_widget_destroy: assertion 'GTK_IS_WIDGET (widget)' failed
(nm-applet:2221): Gtk-WARNING **: 12:09:29.615: Can't set a parent on widget which has a parent