gnome-shell crashed with SIGSEGV in g_type_check_instance_cast()

This crash isn't something that is reproducible and is the first I have seen for some time.

I woke my laptop from suspend mode and used Firefox for about twenty minutes. I tried to open LibreOffice Calc and my system froze completely. No response from keyboard. After a minute or so GNOME Shell restarted and I could again use my laptop. Shortly after I was prompted to report the issue.

ProblemType: Crash
DistroRelease: Ubuntu 18.10
Package: gnome-shell 3.28.1-0ubuntu2
ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
Uname: Linux 4.15.0-22-generic x86_64
ApportVersion: 2.20.10-0ubuntu2
Architecture: amd64
CurrentDesktop: GNOME
Date: Sat May 26 08:41:10 2018
DisplayManager: gdm3
ExecutablePath: /usr/bin/gnome-shell
InstallationDate: Installed on 2017-11-07 (199 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
ProcCmdline: /usr/bin/gnome-shell
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7fb6f8049d12 <g_type_check_instance_cast+34>: mov (%rdi),%rbp
 PC (0x7fb6f8049d12) ok
 source "(%rdi)" (0x00000001) not located in a known VMA region (needed readable region)!
 destination "%rbp" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gnome-shell
StacktraceTop:
 g_type_check_instance_cast () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 st_label_set_text () at /usr/lib/gnome-shell/libst-1.0.so
 ffi_call_unix64 () at /usr/lib/x86_64-linux-gnu/libffi.so.6
 ffi_call () at /usr/lib/x86_64-linux-gnu/libffi.so.6
 () at /usr/lib/libgjs.so.0
Title: gnome-shell crashed with SIGSEGV in g_type_check_instance_cast()
UpgradeStatus: Upgraded to cosmic on 2018-02-21 (93 days ago)
UserGroups: adm cdrom dip kvm lpadmin plugdev sambashare sudo