gnome-calendar crashed with SIGSEGV in g_type_check_instance_is_a()

[Gabriel Ionescu]

I wasn't using the calendar actively. It just crashes in the background. I'm using a Nextcloud account.

ProblemType: Crash
DistroRelease: Ubuntu 18.04
Package: gnome-calendar 3.27.90-1build1
ProcVersionSignature: Ubuntu 4.15.0-11.12-generic 4.15.5
Uname: Linux 4.15.0-11-generic x86_64
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
CrashCounter: 1
CurrentDesktop: ubuntu:GNOME
Date: Wed Mar 14 07:50:21 2018
ExecutablePath: /usr/bin/gnome-calendar
InstallationDate: Installed on 2018-02-13 (28 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180210)
ProcCmdline: /usr/bin/gnome-calendar --gapplication-service
SegvAnalysis:
 Segfault happened at: 0x7f475399c6ae <g_type_check_instance_is_a+62>: testb $0x4,0x16(%rdx)
 PC (0x7f475399c6ae) ok
 source "$0x4" ok
 destination "0x16(%rdx)" (0x80000001a) not located in a known VMA region (needed writable region)!
SegvReason: writing unknown VMA
Signal: 11
SourcePackage: gnome-calendar
StacktraceTop:
 g_type_check_instance_is_a () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 gcal_month_cell_set_date ()
 ?? ()
 g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
Title: gnome-calendar crashed with SIGSEGV in g_type_check_instance_is_a()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 g_type_check_instance_is_a (type_instance=type_instance@entry=0x558fc35d2240, iface_type=<optimized out>) at ../../../../gobject/gtype.c:4013
 GCAL_IS_MONTH_CELL (ptr=0x558fc35d2240) at ../src/views/gcal-month-cell.h:31
 gcal_month_cell_set_date (self=self@entry=0x558fc35d2240, date=date@entry=0x558fc3a7ea40) at ../src/views/gcal-month-cell.c:480
 update_month_cells (self=0x558fc37b83b0) at ../src/views/gcal-month-view.c:983
 g_closure_invoke (closure=0x558fc4277f60, return_value=0x0, n_param_values=1, param_values=0x7fffe7a33680, invocation_hint=0x7fffe7a33600) at ../../../../gobject/gclosure.c:804