Media player crashes on 'sudo stop lightdm'

[Alexandros Frantzis]

Unity8 crashes on 'sudo stop lightdm' with the following error in the log:

terminate called after throwing an instance of 'std::runtime_error'
  what(): org.freedesktop.DBus.Error.Disconnected: Connection is closed

Backtrace is:

#0 __libc_do_syscall () at ../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:44
#1 0xb615ae5e in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#2 0xb615bb4e in __GI_abort () at abort.c:89
#3 0xb6298184 in __gnu_cxx::__verbose_terminate_handler() ()
   from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6
#4 0xb62969b4 in ?? () from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6
#5 0xb6296a0a in std::terminate() () from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6
#6 0xb6296c2a in __cxa_throw () from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6
#7 0xa8f58320 in core::dbus::Bus::remove_match(core::dbus::MatchRule const&) ()
   from /usr/lib/arm-linux-gnueabihf/libdbus-cpp.so.4
#8 0xa901173c in core::dbus::Signal<mpris::Player::Signals::PlaybackStatusChanged, core::ubuntu::media::Player::PlaybackStatus>::~Signal() () from /usr/lib/arm-linux-gnueabihf/libmedia-hub-client.so.1
#9 0xa90117c8 in std::_Sp_counted_ptr<core::dbus::Signal<mpris::Player::Signals::PlaybackStatusChanged, core::ubuntu::media::Player::PlaybackStatus>*, (__gnu_cxx::_Lock_policy)2>::_M_dispose() ()
   from /usr/lib/arm-linux-gnueabihf/libmedia-hub-client.so.1
#10 0xa8ff8286 in std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release() ()
   from /usr/lib/arm-linux-gnueabihf/libmedia-hub-client.so.1
#11 0xa8ff4fe6 in core::ubuntu::media::PlayerStub::~PlayerStub() ()
   from /usr/lib/arm-linux-gnueabihf/libmedia-hub-client.so.1
#12 0xa8ff50a0 in core::ubuntu::media::PlayerStub::~PlayerStub() ()
   from /usr/lib/arm-linux-gnueabihf/libmedia-hub-client.so.1
#13 0xa906f7ce in AalMediaPlayerService::~AalMediaPlayerService() ()
   from /usr/lib/arm-linux-gnueabihf/qt5/plugins/mediaservice/libaalmediaplayer.so
#14 0xa906f80c in AalMediaPlayerService::~AalMediaPlayerService() ()
   from /usr/lib/arm-linux-gnueabihf/qt5/plugins/mediaservice/libaalmediaplayer.so
#15 0xaac02cfe in QMediaPlayer::~QMediaPlayer() ()
   from /usr/lib/arm-linux-gnueabihf/libQt5Multimedia.so.5
#16 0xaac02d18 in QMediaPlayer::~QMediaPlayer() ()
   from /usr/lib/arm-linux-gnueabihf/libQt5Multimedia.so.5
#17 0xa9aa61c4 in ?? ()
   from /usr/lib/arm-linux-gnueabihf/qt5/qml/QtMultimedia/libdeclarative_multimedia.so
Backtrace stopped: previous frame identical to this frame (corrupt stack?)