Rhythmbox crashes on audio playback (when clicking on "Play" button)

Description: Ubuntu 14.04.5 LTS
Release: 14.04

I was using Rhythmbox normally until today.

I expected it to normally playback my audio files. However, when I click on the "Play" button, Rhythmbox either crashes and I have to close it from System Monitor (gnome-system-monitor) or shuts down. However, something weird happens; no Apport window or process shows up.

I think that the Ubuntu developers should really take care of this issue because a lot of people have reported problems with Rhythmbox on AskUbuntu.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: libgstreamer1.0-0 1.2.4-0ubuntu1.1
ProcVersionSignature: Ubuntu 4.4.0-83.106~14.04.1-generic 4.4.70
Uname: Linux 4.4.0-83-generic i686
ApportVersion: 2.14.1-0ubuntu3.24
Architecture: i386
CurrentDesktop: Unity
Date: Sat Jul 8 21:09:56 2017
InstallationDate: Installed on 2017-07-03 (5 days ago)
InstallationMedia: Ubuntu 14.04.5 LTS "Trusty Tahr" - Release i386 (20160803)
ProcEnviron:
 LANGUAGE=el
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=el_GR.UTF-8
 SHELL=/bin/bash
SourcePackage: gstreamer1.0
UpgradeStatus: No upgrade log present (probably fresh install)