Bug#878505: gnome-control-center: network settings seldom crashes on opening VPN options

[definetti]

Package: gnome-control-center
Version: 1:3.26.1-2
Severity: normal

Dear Maintainer,

when trying to access the vpn options dialog, the application crashes.

Steps to reproduce: open gnome-control-center, go to "network" tab and try to
open an installed VPN options (gear icon)

Expected behavior: options dialog opens

Real behavior: application crashes with error

(gnome-control-center:9164): GLib-GObject-CRITICAL **:
g_type_instance_get_private: assertion 'instance != NULL && instance->g_class
!= NULL' failed

(gnome-control-center:9164): GLib-GObject-CRITICAL **: g_object_ref: assertion
'G_IS_OBJECT (object)' failed

Notes: it rarely occurs that the settings dialog opens properly



-- System Information:
Debian Release: buster/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.13.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8), LANGUAGE=en_US.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages gnome-control-center depends on:
ii  accountsservice            0.6.45-1
ii  apg                        2.2.3.dfsg.1-5
ii  colord                     1.3.3-2
ii  desktop-file-utils         0.23-2
ii  gnome-control-center-data  1:3.26.1-2
ii  gnome-desktop3-data        3.26.1-1
ii  gnome-settings-daemon      3.26.1-2
ii  gsettings-desktop-schemas  3.24.1-1
ii  libaccountsservice0        0.6.45-1
ii  libatk1.0-0                2.26.0-2
ii  libc6                      2.24-17
ii  libcairo-gobject2          1.14.10-1
ii  libcairo2                  1.14.10-1
ii  libcanberra-gtk3-0         0.30-3
ii  libcanberra0               0.30-3
ii  libcheese-gtk25            3.26.0-1+b1
ii  libcheese8                 3.26.0-1+b1
ii  libclutter-1.0-0           1.26.2+dfsg-3
ii  libclutter-gtk-1.0-0       1.8.4-2
ii  libcolord-gtk1             0.1.26-1.1
ii  libcolord2                 1.3.3-2
ii  libcups2                   2.2.4-9
ii  libfontconfig1             2.12.3-0.2
ii  libgdk-pixbuf2.0-0         2.36.11-1
ii  libglib2.0-0               2.54.1-1
ii  libgnome-bluetooth13       3.26.1-1
ii  libgnome-desktop-3-12      3.26.1-1
ii  libgoa-1.0-0b              3.26.1-1
ii  libgoa-backend-1.0-1       3.26.1-1
ii  libgrilo-0.3-0             0.3.4-1
ii  libgtk-3-0                 3.22.24-1
ii  libgtop-2.0-11             2.38.0-1
ii  libgudev-1.0-0             232-1
ii  libibus-1.0-5              1.5.14-3
ii  libkrb5-3                  1.15.1-2
ii  libmm-glib0                1.6.8-1
ii  libnm0                     1.8.4-3
ii  libnma0                    1.8.4-1
ii  libpango-1.0-0             1.40.12-1
ii  libpangocairo-1.0-0        1.40.12-1
ii  libpolkit-gobject-1-0      0.105-18
ii  libpulse-mainloop-glib0    11.1-1
ii  libpulse0                  11.1-1
ii  libpwquality1              1.4.0-1
ii  libsmbclient               2:4.6.7+dfsg-2
ii  libsoup2.4-1               2.60.1-1
ii  libupower-glib3            0.99.6-1
ii  libwacom2                  0.26-1
ii  libx11-6                   2:1.6.4-3
ii  libxi6                     2:1.7.9-1
ii  libxml2                    2.9.4+dfsg1-4

Versions of packages gnome-control-center recommends:
ii  cracklib-runtime              2.9.2-5+b1
ii  cups-pk-helper                0.2.6-1+b1
ii  gkbd-capplet                  3.26.0-2
ii  gnome-online-accounts         3.26.1-1
ii  gnome-user-guide              3.26.0.1-1
ii  gnome-user-share              3.18.3-2
ii  iso-codes                     3.76-1
ii  libcanberra-pulse             0.30-3
ii  libnss-myhostname             235-2
ii  mousetweaks                   3.12.0-2
ii  network-manager-gnome         1.8.4-1
ii  policykit-1                   0.105-18
ii  pulseaudio-module-bluetooth   11.1-1
ii  realmd                        0.16.3-1
ii  rygel                         0.32.1-5
ii  rygel-tracker                 0.32.1-5
ii  system-config-printer-common  1.5.9-2

Versions of packages gnome-control-center suggests:
ii  gnome-software           3.26.1-1
ii  gstreamer1.0-pulseaudio  1.12.3-1
ii  libcanberra-gtk-module   0.30-3
ii  libcanberra-gtk3-module  0.30-3
ii  x11-xserver-utils        7.7+7+b1

-- no debconf information