Application: amarok (2.8.0)
KDE Platform Version: 4.14.33
Qt Version: 4.8.6
Operating System: Linux 4.4.92-31-default x86_64
Distribution: "openSUSE Leap 42.3"

-- Information about the crash:
Env: Opensuse Leap 42.3
Current user applications in the system - Firefox, Thunderbird, Dolphin, CherryTree (note), WiFi, HPLIP service, KNotes, Plasma5.
Start Amarok. It crashes and displays error message. 
Re-start Amarok. It crashes and displays error message.

The crash can be reproduced every time.

-- Backtrace:
Application: Amarok (amarok), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f86dbfb8940 (LWP 17702))]

Thread 2 (Thread 0x7f86b3b58700 (LWP 17704)):
#0  0x00007f86c5e3ba40 in pa_pstream_unref () at /usr/lib64/pulseaudio/libpulsecommon-9.0.so
#1  0x00007f86c5e3bfc7 in  () at /usr/lib64/pulseaudio/libpulsecommon-9.0.so
#2  0x00007f86c5e3c84a in  () at /usr/lib64/pulseaudio/libpulsecommon-9.0.so
#3  0x00007f86cfd0aa14 in pa_mainloop_dispatch () at /usr/lib64/libpulse.so.0
#4  0x00007f86cfd0adea in pa_mainloop_iterate () at /usr/lib64/libpulse.so.0
#5  0x00007f86cfd0ae90 in pa_mainloop_run () at /usr/lib64/libpulse.so.0
#6  0x00007f86cfd19006 in  () at /usr/lib64/libpulse.so.0
#7  0x00007f86c5e4c408 in  () at /usr/lib64/pulseaudio/libpulsecommon-9.0.so
#8  0x00007f86d7883744 in start_thread () at /lib64/libpthread.so.0
#9  0x00007f86d8c78aad in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7f86dbfb8940 (LWP 17702)):
[KCrash Handler]
#6  0x00007f86b7d98ce7 in  () at /usr/lib64/kde4/plugins/phonon_backend/phonon_gstreamer.so
#7  0x00007f86b7d98ee2 in  () at /usr/lib64/kde4/plugins/phonon_backend/phonon_gstreamer.so
#8  0x00007f86b7d98697 in  () at /usr/lib64/kde4/plugins/phonon_backend/phonon_gstreamer.so
#9  0x00007f86b7d992f2 in  () at /usr/lib64/kde4/plugins/phonon_backend/phonon_gstreamer.so
#10 0x00007f86b7d8f973 in  () at /usr/lib64/kde4/plugins/phonon_backend/phonon_gstreamer.so
#11 0x00007f86d86ba19e in  () at /usr/lib64/libphonon.so.4
#12 0x00007f86d86ba855 in Phonon::Path::reconnect(Phonon::MediaNode*, Phonon::MediaNode*) () at /usr/lib64/libphonon.so.4
#13 0x00007f86d86bb10d in Phonon::createPath(Phonon::MediaNode*, Phonon::MediaNode*) () at /usr/lib64/libphonon.so.4
#14 0x00007f86db9a2b10 in EngineController::initializePhonon() () at /usr/lib64/libamaroklib.so.1
#15 0x00007f86db9a91c5 in  () at /usr/lib64/libamaroklib.so.1
#16 0x00007f86d9446218 in QMetaMethod::invoke(QObject*, Qt::ConnectionType, QGenericReturnArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument) const () at /usr/lib64/libQtCore.so.4
#17 0x00007f86d94486f2 in QMetaObject::invokeMethod(QObject*, char const*, Qt::ConnectionType, QGenericReturnArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument) () at /usr/lib64/libQtCore.so.4
#18 0x00007f86dba690fd in  () at /usr/lib64/libamaroklib.so.1
#19 0x00007f86dba69161 in  () at /usr/lib64/libamaroklib.so.1
#20 0x00007f86db99babd in App::continueInit() () at /usr/lib64/libamaroklib.so.1
#21 0x00007f86db99cc16 in App::App() () at /usr/lib64/libamaroklib.so.1
#22 0x0000000000407f97 in  ()
#23 0x00007f86d8baf6e5 in __libc_start_main () at /lib64/libc.so.6
#24 0x00000000004080c9 in _start ()

Reported using DrKonqi