ubuntu-bug dumps the core

[Uqbar]

While reporting a bug against plasma-desktop package, I've got a "core dump" error.

[enzo@Feynman ~] file core
core: ELF 64-bit LSB core file x86-64, version 1 (SYSV), SVR4-style, from '/usr/bin/python3 /usr/share/apport/apport-kde plasma-desktop'

while this very report (ubuntu-bug apport-kde) didn't dump the core!
I attache the core file.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: apport-kde 2.20.1-0ubuntu2
Uname: Linux 4.4.11-040411-lowlatency x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CrashReports:
 640:1000:114:1588271:2016-05-20 19:06:28.779907240 +0200:2016-05-23 16:31:38.612412847 +0200:/var/crash/_usr_bin_kactivitymanagerd.1000.crash
 640:1000:114:11309814:2016-05-23 16:31:31.122396640 +0200:2016-05-23 16:31:31.123396643 +0200:/var/crash/_usr_share_apport_apport-kde.1000.crash
CurrentDesktop: KDE
Date: Mon May 23 16:54:28 2016
InstallationDate: Installed on 2016-04-22 (31 days ago)
InstallationMedia: Kubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
PackageArchitecture: all
SourcePackage: apport
UpgradeStatus: No upgrade log present (probably fresh install)