Example of crash:

#5 0x00000000006e6ba0 in QListData::shared_null ()
#6 0x0000000000438048 in KGpgItemModel::delNode (this=0x18e0770, node=0x257ddd0) at ../../kgpg/model/kgpgitemmodel.cpp:221
#7 0x000000000045fe87 in KeysManager::slotDelKeyDone (this=0x1ac2be0, res=<value optimized out>) at ../../kgpg/keysmanager.cpp:2381
#8 0x0000000000477c7e in KeysManager::qt_metacall (this=0x1ac2be0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffd0b7e3a0) at ./keysmanager.moc:333
#9 0x00007fd372368ddc in QMetaObject::activate (sender=0x1e66940, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x1) at kernel/qobject.cpp:3113
#10 0x000000000044341c in KGpgTransaction::done (this=0x257ddd0, _t1=0) at ./kgpgtransaction.moc:86
#11 0x00000000004443a5 in KGpgTransaction::qt_metacall (this=0x1e66940, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffd0b7e4e0) at ./kgpgtransaction.moc:74
#12 0x00007fd372368ddc in QMetaObject::activate (sender=0x25aa510, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x1) at kernel/qobject.cpp:3113
#13 0x000000000048fba0 in GPGProc::processExited (this=0x257ddd0, _t1=0x25aa510) at ./gpgproc.moc:95
#14 0x000000000048fc9c in GPGProc::qt_metacall (this=0x25aa510, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffd0b7e620) at ./gpgproc.moc:75
#15 0x00007fd372368ddc in QMetaObject::activate (sender=0x25aa510, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x1) at kernel/qobject.cpp:3113
#16 0x00007fd3722f563f in QProcess::finished (this=0x257ddd0, _t1=0, _t2=QProcess::NormalExit) at .moc/release-shared/moc_qprocess.cpp:136
#17 0x00007fd3722faba7 in QProcessPrivate::_q_processDied (this=0x259d2e0) at io/qprocess.cpp:718
#18 0x00007fd3722fac69 in QProcess::qt_metacall (this=0x25aa510, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffd0b7e830) at .moc/release-shared/moc_qprocess.cpp:109
#19 0x00007fd37299fc88 in KProcess::qt_metacall (this=0x257ddd0, _c=3501711696, _id=1919178208, _a=0x1) at ./kprocess.moc:63
#20 0x0000000000490938 in KLineBufferedProcess::qt_metacall (this=0x257ddd0, _c=3501711696, _id=1919178208, _a=0x1) at ./klinebufferedprocess.moc:68
#21 0x000000000048fc30 in GPGProc::qt_metacall (this=0x257ddd0, _c=3501711696, _id=1919178208, _a=0x1) at ./gpgproc.moc:68
#22 0x00007fd372368ddc in QMetaObject::activate (sender=0x1fc3f00, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x1) at kernel/qobject.cpp:3113
#23 0x00007fd37239ee9e in QSocketNotifier::activated (this=0x257ddd0, _t1=26) at .moc/release-shared/moc_qsocketnotifier.cpp:83
#24 0x00007fd37236d773 in QSocketNotifier::event (this=0x1fc3f00, e=0x7fffd0b7ed70) at kernel/qsocketnotifier.cpp:316
#25 0x00007fd372ee4efc in QApplicationPrivate::notify_helper (this=0x18ea640, receiver=0x1fc3f00, e=0x7fffd0b7ed70) at kernel/qapplication.cpp:4056
#26 0x00007fd372eec1ce in QApplication::notify (this=0x18e0c90, receiver=0x1fc3f00, e=0x7fffd0b7ed70) at kernel/qapplication.cpp:4021
#27 0x00007fd373b1bab6 in KApplication::notify (this=0x18e0c90, receiver=0x1fc3f00, event=0x7fffd0b7ed70) at ../../kdeui/kernel/kapplication.cpp:302
#28 0x00007fd372353c2c in QCoreApplication::notifyInternal (this=0x18e0c90, receiver=0x1fc3f00, event=0x7fffd0b7ed70) at kernel/qcoreapplication.cpp:610
#29 0x00007fd37237c42a in QCoreApplication::sendEvent (source=0x18f00d0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#30 socketNotifierSourceDispatch (source=0x18f00d0) at kernel/qeventdispatcher_glib.cpp:110
#31 0x00007fd36e480bce in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#32 0x00007fd36e484598 in ?? () from /lib/libglib-2.0.so.0
#33 0x00007fd36e4846c0 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#34 0x00007fd37237c1a6 in QEventDispatcherGlib::processEvents (this=0x18becb0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#35 0x00007fd372f794be in QGuiEventDispatcherGlib::processEvents (this=0x257ddd0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#36 0x00007fd372352532 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#37 0x00007fd372352904 in QEventLoop::exec (this=0x7fffd0b7efd0, flags=) at kernel/qeventloop.cpp:201
#38 0x00007fd372354ab9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#39 0x000000000047aa84 in main (argc=<value optimized out>, argv=<value optimized out>) at ../../kgpg/main.cpp:57