Python stack trace when running `ubuntu-bug nautilus` in disco

ERROR: hook /usr/share/apport/package-hooks/source_nautilus.py crashed:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apport/report.py", line 205, in _run_hook
    symb['add_info'](report, ui)
TypeError: add_info() takes 1 positional argument but 2 were given

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apport/report.py", line 210, in _run_hook
    symb['add_info'](report)
  File "/usr/share/apport/package-hooks/source_nautilus.py", line 23, in add_info
    report["usr_lib_nautilus"] = package_versions(*sorted(plugin_packages))
TypeError: '<' not supported between instances of 'NoneType' and 'str'

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: apport 2.20.10-0ubuntu19
ProcVersionSignature: Ubuntu 4.18.0-13.14-generic 4.18.17
Uname: Linux 4.18.0-13-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.10-0ubuntu19
Architecture: amd64
CrashReports:
 640:0:119:606530:2019-01-21 14:49:01.440511009 -0500:2019-01-21 14:49:01.136510154 -0500:/var/crash/_opt_penguindome_client_client-cron.py.0.crash
 640:0:119:2444106:2019-01-21 14:54:50.761487081 -0500:2019-01-21 14:54:48.449619152 -0500:/var/crash/_usr_lib_packagekit_packagekitd.0.crash
 640:1000:119:3237446:2019-01-21 14:54:03.516504591 -0500:2019-01-21 14:54:00.808239070 -0500:/var/crash/_usr_lib_tracker_tracker-extract.1000.crash
 640:1000:119:4471123:2019-01-21 15:43:11.507506447 -0500:2019-01-21 15:43:07.863473435 -0500:/var/crash/_usr_bin_nautilus.1000.crash
CurrentDesktop: ubuntu:GNOME
Date: Mon Jan 21 15:55:09 2019
InstallationDate: Installed on 2019-01-02 (19 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
PackageArchitecture: all
SourcePackage: apport
UpgradeStatus: Upgraded to disco on 2019-01-21 (0 days ago)