Apport caused the entire system to freeze when I forced-quit it

When I wanted to stop Apport from uploading something that did not need to be uploaded, I clicked the X button on the Window meant to close it.

Apport froze, and I was asked whether to force-quit the program or wait. I forced-quit the app. The entire machine froze, not even the machine responded, even though only apport was quit.

apport:
  Installed: 2.20.9-0ubuntu7.9
  Candidate: 2.20.9-0ubuntu7.9
  Version table:
 *** 2.20.9-0ubuntu7.9 500
        500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu bionic-security/main i386 Packages
        500 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
        500 http://us.archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages
        100 /var/lib/dpkg/status
     2.20.9-0ubuntu7 500
        500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        500 http://us.archive.ubuntu.com/ubuntu bionic/main i386 Packages

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: apport 2.20.9-0ubuntu7.9
ProcVersionSignature: Ubuntu 5.0.0-37.40~18.04.1-generic 5.0.21
Uname: Linux 5.0.0-37-generic x86_64
ApportLog:

ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
Date: Fri Dec 6 13:53:58 2019
InstallationDate: Installed on 2019-12-01 (5 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
PackageArchitecture: all
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: apport
UpgradeStatus: No upgrade log present (probably fresh install)