gitg freezes for no specific reason

I was using gitg, clicking on commits to see their content. Suddenly, it stops responding altogether. This is from a fresh install.

I have already have had issues with gitg, but it was usually crashes (see https://bugs.launchpad.net/ubuntu/+source/gitg/+bug/1090283 for an instance). This time, it doesn’t crash: it just no longer respond.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gitg 3.26.0-4
ProcVersionSignature: Ubuntu 4.15.0-1057.66-oem 4.15.18
Uname: Linux 4.15.0-1057-oem x86_64
ApportVersion: 2.20.9-0ubuntu7.7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Wed Oct 2 18:05:49 2019
DistributionChannelDescriptor:
 # This is the distribution channel descriptor for the OEM CDs
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-bionic-amd64-20180608-47+berlinetta-cfl-r+X77
InstallationDate: Installed on 2019-08-28 (34 days ago)
InstallationMedia: Ubuntu 18.04 "Bionic" - Build amd64 LIVE Binary 20180608-09:38
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: gitg
UpgradeStatus: No upgrade log present (probably fresh install)