mate-settings-daemon crashed with SIGABRT in g_assertion_message()

[Alexander]

Suddenly

ProblemType: Crash
DistroRelease: Ubuntu 18.04
Package: mate-settings-daemon 1.20.0-2ubuntu0
ProcVersionSignature: Ubuntu 4.15.0-12.13-generic 4.15.7
Uname: Linux 4.15.0-12-generic x86_64
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
CurrentDesktop: MATE
Date: Tue Mar 27 12:15:49 2018
ExecutablePath: /usr/bin/mate-settings-daemon
InstallationDate: Installed on 2017-12-04 (112 days ago)
InstallationMedia: Ubuntu-MATE 18.04 LTS "Bionic Beaver" - Alpha amd64 (20171204)
ProcCmdline: /usr/bin/mate-settings-daemon
ProcEnviron:
 LANGUAGE=ru
 PATH=(custom, user)
 XDG_RUNTIME_DIR=<set>
 LANG=ru_RU.UTF-8
 SHELL=/bin/bash
Signal: 6
SourcePackage: mate-settings-daemon
StacktraceTop:
 g_assertion_message () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 g_assertion_message () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 gtk_widget_get_parent_window () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
 ?? ()
 ?? ()
Title: mate-settings-daemon crashed with SIGABRT in g_assertion_message()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip docker lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 g_assertion_message () from /tmp/apport_sandbox_s2x4y_qg/lib/x86_64-linux-gnu/libglib-2.0.so.0
 g_assertion_message () from /tmp/apport_sandbox_s2x4y_qg/lib/x86_64-linux-gnu/libglib-2.0.so.0
 gtk_widget_get_parent_window (widget=0x56126587e9b0) at ../../../../gtk/gtkwidget.c:10691
 ?? ()
 ?? ()

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Launchpad Janitor (janitor)]

[Expired for mate-settings-daemon (Ubuntu) because there has been no activity for 60 days.]