Version:           1.2.1-git-9ad411166dcb21534e968e362dc77559f807e8fe (using KDE 4.3.4)
Compiler:          gcc-4.4.2 
OS:                Linux
Installed from:    Gentoo Packages

1. Send something to yourself (cancel or finish it)
2. Send something to yourself or someone else
3. Select the active transfer (by clicking)
4. Press right
-> crash

(maybe easier to reproduce but works like this)

#5  QSortFilterProxyModelPrivate::proxy_to_source (this=0xe2eed0, proxy_index=...) at itemviews/qsortfilterproxymodel.cpp:332
#6  0x00007fc6c114478d in QSortFilterProxyModel::mapToSource (this=<value optimized out>, proxyIndex=...) at itemviews/qsortfilterproxymodel.cpp:2421
#7  0x00007fc6c1143bb4 in QSortFilterProxyModel::flags (this=0xe2eed0, index=...) at itemviews/qsortfilterproxymodel.cpp:1912
#8  0x00007fc6c10c39da in QAbstractItemViewPrivate::isIndexEnabled (this=<value optimized out>, index=...) at ../../include/QtGui/private/../../../src/gui/itemviews/qabstractitemview_p.h:275
#9  0x00007fc6c10ba6eb in QAbstractItemView::keyPressEvent (this=0xd9f6e0, event=0x7fffa22804a0) at itemviews/qabstractitemview.cpp:2176
#10 0x00007fc6c1107068 in QTreeView::keyPressEvent (this=<value optimized out>, event=<value optimized out>) at itemviews/qtreeview.cpp:1933
#11 0x00007fc6c0c0bd17 in QWidget::event (this=0xd9f6e0, event=0x7fffa22804a0) at kernel/qwidget.cpp:8009
#12 0x00007fc6c0f9db9e in QFrame::event (this=0xd9f6e0, e=0x7fffa22804a0) at widgets/qframe.cpp:557
#13 0x00007fc6c10250b3 in QAbstractScrollArea::event (this=0xd9f6e0, e=0x7fffa22804a0) at widgets/qabstractscrollarea.cpp:985
#14 0x00007fc6c10bf3cb in QAbstractItemView::event (this=0xd9f6e0, event=0x7fffa22804a0) at itemviews/qabstractitemview.cpp:1524
#15 0x00007fc6c0bb221c in QApplicationPrivate::notify_helper (this=0xbebd30, receiver=0xd9f6e0, e=0x7fffa22804a0) at kernel/qapplication.cpp:4242
#16 0x00007fc6c0bbb43b in QApplication::notify (this=<value optimized out>, receiver=0xd9f6e0, e=0x7fffa22804a0) at kernel/qapplication.cpp:3720
#17 0x00007fc6c285b548 in KApplication::notify (this=0x7fffa2281420, receiver=0xd9f6e0, event=0x7fffa22804a0)
    at /var/tmp/portage/kde-base/kdelibs-4.3.4/work/kdelibs-4.3.4/kdeui/kernel/kapplication.cpp:302
#18 0x00007fc6c19c9ecb in QCoreApplication::notifyInternal (this=0x7fffa2281420, receiver=0xd9f6e0, event=0x7fffa22804a0) at kernel/qcoreapplication.cpp:704
#19 0x00007fc6c0c564b7 in QKeyMapper::sendKeyEvent (keyWidget=0xd9f6e0, grab=<value optimized out>, type=<value optimized out>, code=16777236, modifiers=<value optimized out>, text=..., autorepeat=
    false, count=1, nativeScanCode=102, nativeVirtualKey=65363, nativeModifiers=16) at kernel/qkeymapper_x11.cpp:1861
#20 0x00007fc6c0c59271 in QKeyMapperPrivate::translateKeyEvent (this=0xc5e3d0, keyWidget=0xd9f6e0, event=<value optimized out>, grab=208) at kernel/qkeymapper_x11.cpp:1831
#21 0x00007fc6c0c31e78 in QApplication::x11ProcessEvent (this=<value optimized out>, event=0x7fffa2281060) at kernel/qapplication_x11.cpp:3394
#22 0x00007fc6c0c5b42c in x11EventSourceDispatch (s=0xbef650, callback=<value optimized out>, user_data=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:146
#23 0x00007fc6bd1e69c3 in g_main_dispatch (context=0xbee530) at gmain.c:1960
#24 IA__g_main_context_dispatch (context=0xbee530) at gmain.c:2513
#25 0x00007fc6bd1ea1f0 in g_main_context_iterate (context=0xbee530, block=<value optimized out>, dispatch=<value optimized out>, self=<value optimized out>) at gmain.c:2591
#26 0x00007fc6bd1ea308 in IA__g_main_context_iteration (context=0xbee530, may_block=1) at gmain.c:2654
#27 0x00007fc6c19f675e in QEventDispatcherGlib::processEvents (this=0xbb55b0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:407
#28 0x00007fc6c0c5ad66 in QGuiEventDispatcherGlib::processEvents (this=0x7fffa227f570, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#29 0x00007fc6c19c86d2 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#30 0x00007fc6c19c8a9d in QEventLoop::exec (this=0x7fffa2281390, flags=) at kernel/qeventloop.cpp:201
#31 0x00007fc6c19cb07b in QCoreApplication::exec () at kernel/qcoreapplication.cpp:981
#32 0x00000000004641f0 in main (argc=<value optimized out>, argv=<value optimized out>) at /var/tmp/portage/net-irc/konversation-svn-1.2/work/konversation-svn-1.2/src/main.cpp:102