Application that crashed: nspluginviewer
Version of the application: 
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.3
Operating System: Linux 2.6.31-ARCH i686

What I was doing when the application crashed:
Apparently this one is a duplicate of https://bugs.kde.org/show_bug.cgi?id=209939

I don't know why this happened

 -- Backtrace:
Application: nspluginviewer (nspluginviewer), signal: Segmentation fault
[Current thread is 1 (Thread 0xb5620700 (LWP 3200))]

Thread 3 (Thread 0xb10b2b70 (LWP 3513)):
#0  0xb7842424 in __kernel_vsyscall ()
#1  0xb5d71b95 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb5f267cd in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libc.so.6
#3  0xb315278f in ?? () from /usr/lib/mozilla/plugins/libflashplayer.so
#4  0xb3283b3f in ?? () from /usr/lib/mozilla/plugins/libflashplayer.so
#5  0xb3152c3d in ?? () from /usr/lib/mozilla/plugins/libflashplayer.so
#6  0xb5d6d65c in start_thread () from /lib/libpthread.so.0
#7  0xb5f191fe in clone () from /lib/libc.so.6

Thread 2 (Thread 0xb18b3b70 (LWP 3514)):
#0  0xb7842424 in __kernel_vsyscall ()
#1  0xb5d71b95 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb5f267cd in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libc.so.6
#3  0xb315278f in ?? () from /usr/lib/mozilla/plugins/libflashplayer.so
#4  0xb3283b3f in ?? () from /usr/lib/mozilla/plugins/libflashplayer.so
#5  0xb3152c3d in ?? () from /usr/lib/mozilla/plugins/libflashplayer.so
#6  0xb5d6d65c in start_thread () from /lib/libpthread.so.0
#7  0xb5f191fe in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb5620700 (LWP 3200)):
[KCrash Handler]
#6  0xb75a2006 in g_slice_alloc () from /usr/lib/libglib-2.0.so.0
#7  0xb75a26b5 in g_slice_alloc0 () from /usr/lib/libglib-2.0.so.0
#8  0xb59b4a97 in g_type_create_instance () from /usr/lib/libgobject-2.0.so.0
#9  0xb5999b48 in g_object_constructor () from /usr/lib/libgobject-2.0.so.0
#10 0xb599af62 in g_object_newv () from /usr/lib/libgobject-2.0.so.0
#11 0xb599b98a in g_object_new_valist () from /usr/lib/libgobject-2.0.so.0
#12 0xb599bb0e in g_object_new () from /usr/lib/libgobject-2.0.so.0
#13 0xb2ea1f9c in gtk_plug_new_for_display () from /usr/lib/libgtk-x11-2.0.so.0
#14 0xb2ea1fe6 in gtk_plug_new () from /usr/lib/libgtk-x11-2.0.so.0
#15 0xb31459cd in ?? () from /usr/lib/mozilla/plugins/libflashplayer.so
#16 0xb313b581 in ?? () from /usr/lib/mozilla/plugins/libflashplayer.so
#17 0xb313fdb4 in ?? () from /usr/lib/mozilla/plugins/libflashplayer.so
#18 0x085a90e8 in ?? ()
#19 0xbfec6668 in ?? ()
#20 0xbfec6608 in ?? ()
#21 0xb6b66da1 in QObjectPrivate::~QObjectPrivate() () from /usr/lib/libQtCore.so.4
#22 0x080502d8 in ?? ()
#23 0x0805e2c3 in ?? ()
#24 0x0805d615 in ?? ()
#25 0x08057cff in ?? ()
#26 0x0805e9ac in ?? ()
#27 0xb7625667 in ?? () from /usr/lib/libQtDBus.so.4
#28 0xb762670d in ?? () from /usr/lib/libQtDBus.so.4
#29 0xb7626fe4 in ?? () from /usr/lib/libQtDBus.so.4
#30 0xb762728a in ?? () from /usr/lib/libQtDBus.so.4
#31 0xb6b623ce in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#32 0xb61a5924 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#33 0xb61ad00c in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#34 0xb70910da in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#35 0xb6b525bb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#36 0xb6b531e2 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQtCore.so.4
#37 0xb6b533ad in QCoreApplication::sendPostedEvents(QObject*, int) () from /usr/lib/libQtCore.so.4
#38 0xb6b7d1cf in ?? () from /usr/lib/libQtCore.so.4
#39 0xb7584328 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#40 0xb7587ba0 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#41 0xb7587cd3 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#42 0xb6b7cd25 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#43 0xb6243705 in ?? () from /usr/lib/libQtGui.so.4
#44 0xb6b50ba9 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#45 0xb6b50ffa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#46 0xb6b5346f in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#47 0xb61a57a7 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#48 0x0805c5f0 in ?? ()
#49 0xb5e62a36 in __libc_start_main () from /lib/libc.so.6
#50 0x0804e511 in _start ()

Reported using DrKonqi