Confirmed, backtrace

#0  0xb3dfd693 in KHTMLFindBar::pattern (this=0x0)
    at /usr/local/trunk-src/kdelibs/khtml/find/khtmlfindbar.cpp:103
#1  0xb3dfae57 in KHTMLFind::activate (this=0x8c48358)
    at /usr/local/trunk-src/kdelibs/khtml/find/khtmlfind.cpp:231
#2  0xb3dfaef3 in KHTMLFind::findTextNext (this=0x8c48358, reverse=false)
    at /usr/local/trunk-src/kdelibs/khtml/find/khtmlfind.cpp:277
#3  0xb3d92b8f in KHTMLPart::pFindTextNextInThisFrame (this=0x8f6bce8,
    reverse=false) at /usr/local/trunk-src/kdelibs/khtml/khtml_part.cpp:3051
#4  0xb3dfba01 in KHTMLFind::findTextNext (this=0x8a7bfd0, reverse=false)
    at /usr/local/trunk-src/kdelibs/khtml/find/khtmlfind.cpp:435
#5  0xb3d92bfe in KHTMLPart::findTextNext (this=0x8780248, reverse=false)
    at /usr/local/trunk-src/kdelibs/khtml/khtml_part.cpp:3046
#6  0xb3d67648 in KHTMLView::findAhead (this=0x8a7a948, increase=true)
    at /usr/local/trunk-src/kdelibs/khtml/khtmlview.cpp:1916
#7  0xb3d6f25a in KHTMLView::keyPressEvent (this=0x8a7a948, _ke=0xbfa627c4)
    at /usr/local/trunk-src/kdelibs/khtml/khtmlview.cpp:1705
#8  0xb6a03884 in QWidget::event (this=0x8a7a948, event=0xbfa627c4)
    at kernel/qwidget.cpp:7551
#9  0xb6e12828 in QFrame::event (this=0x8a7a948, e=0xbfa627c4)
    at widgets/qframe.cpp:559
#10 0xb6eb12ff in QAbstractScrollArea::event (this=0x8a7a948, e=0xbfa627c4)
    at widgets/qabstractscrollarea.cpp:918
#11 0xb6eb7a83 in QScrollArea::event (this=0x8a7a948, e=0xbfa627c4)
    at widgets/qscrollarea.cpp:314
#12 0xb3d6ea8c in KHTMLView::event (this=0x8a7a948, e=0xbfa627c4)
    at /usr/local/trunk-src/kdelibs/khtml/khtmlview.cpp:540
#13 0xb69a2783 in QApplicationPrivate::notify_helper (this=0x84064e0,
    receiver=0x8a7a948, e=0xbfa627c4) at kernel/qapplication.cpp:4084
#14 0xb69a2f1c in QApplication::notify (this=0xbfa632e0, receiver=0x8a7a948,
    e=0xbfa627c4) at kernel/qapplication.cpp:3690
#15 0xb783d87d in KApplication::notify (this=0xbfa632e0, receiver=0x8a7a948,
    event=0xbfa627c4)
    at /usr/local/trunk-src/kdelibs/kdeui/kernel/kapplication.cpp:307
#16 0xb730780b in QCoreApplication::notifyInternal (this=0xbfa632e0,
    receiver=0x8a7a948, event=0xbfa627c4) at kernel/qcoreapplication.cpp:598
#17 0xb69ae3e7 in QCoreApplication::sendSpontaneousEvent (receiver=0x8a7a948,
    event=0xbfa627c4)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#18 0xb69a2294 in qt_sendSpontaneousEvent (receiver=0x8a7a948,
    event=0xbfa627c4) at kernel/qapplication.cpp:5004
#19 0xb6a4cb38 in QKeyMapper::sendKeyEvent (keyWidget=0x8a7a948, grab=false,
    type=QEvent::KeyPress, code=70, modifiers={i = -1079629128},
    text=@0xbfa62a84, autorepeat=false, count=1, nativeScanCode=41,
    nativeVirtualKey=102, nativeModifiers=0) at kernel/qkeymapper_x11.cpp:1675
#20 0xb6a4dcc6 in QKeyMapperPrivate::translateKeyEvent (this=0x842fb38,
    keyWidget=0x8a7a948, event=0xbfa62f30, grab=false)
    at kernel/qkeymapper_x11.cpp:1645
#21 0xb6a25864 in QApplication::x11ProcessEvent (this=0xbfa632e0,
    event=0xbfa62f30) at kernel/qapplication_x11.cpp:3436
#22 0xb6a50125 in x11EventSourceDispatch (s=0x8409440, callback=0,
    user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#23 0xb61f57ca in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#24 0xb61f8ee8 in ?? () from /usr/lib/libglib-2.0.so.0
#25 0xb61f90a8 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#26 0xb7336556 in QEventDispatcherGlib::processEvents (this=0x84064a0, flags=
      {i = -1079627528}) at kernel/qeventdispatcher_glib.cpp:323
#27 0xb6a4f940 in QGuiEventDispatcherGlib::processEvents (this=0x84064a0,
    flags={i = -1079627480}) at kernel/qguieventdispatcher_glib.cpp:202
#28 0xb73047f0 in QEventLoop::processEvents (this=0xbfa631b0, flags=
      {i = -1079627408}) at kernel/qeventloop.cpp:149
#29 0xb7304a4a in QEventLoop::exec (this=0xbfa631b0, flags={i = -1079627336})
    at kernel/qeventloop.cpp:196
#30 0xb7307fe3 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#31 0xb69a249c in QApplication::exec () at kernel/qapplication.cpp:3553
#32 0xb7f25873 in kdemain (argc=1, argv=0xbfa636c4)
    at /usr/local/trunk-src/kdebase/apps/konqueror/src/konqmain.cpp:257
#33 0x080486d6 in main (argc=1575323989, argv=0xe58955c3)
    at /home/annma/build/kdebase/apps/konqueror/src/konqueror_dummy.cpp:3

It looks like this was reported already.

*** This bug has been marked as a duplicate of bug 189201 ***