simple-image-reducer crashes in U 18.04

[pigs-on-the-swim]

simple-image-reducer crashes w/o a error message in U 18.04 and in U18.10

If simple-image-reducer starts from GUI or from CLI it is possible to add file addresses/names to proceed. The setiings / options can be chosen. When the "Execute" button is pressed the simple-image-reducer window disappears. There are no result files written.

Starting fom CLI (just type simple-image-reducer at prompt and enter) does not even return an error.

I was not able to identify any related entries in /var/log/syslog or in dmesg.

This bug is present on 4 of our machines. All are running U18.n and have been updated from U 16.n.

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: simple-image-reducer 1.0.2-7
ProcVersionSignature: Ubuntu 4.18.0-7.8-generic 4.18.5
Uname: Linux 4.18.0-7-generic x86_64
ApportVersion: 2.20.10-0ubuntu13.1
Architecture: amd64
CurrentDesktop: XFCE
Date: Wed Nov 7 15:32:15 2018
InstallationDate: Installed on 2016-09-02 (795 days ago)
InstallationMedia: Ubuntu 14.04.4 LTS "Trusty Tahr" - Release amd64 (20160217.1)
PackageArchitecture: all
SourcePackage: simple-image-reducer
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[pigs-on-the-swim (dw1-4)]

the issue did not appear in recent releases of Ubuntu. I did not experience it for more than a year.
I consider this bug to be fixed.
Question:
What can I do to get the bug closed?