Version:           0.50.50 (using 4.00.68 (KDE 4.0.68 >= 20080402), Gentoo)
Compiler:          i686-pc-linux-gnu-gcc
OS:                Linux (i686) release 2.6.23-gentoo-r9

Steps to reproduce:

1) Delete a contact on your contact list
2) Close kopete via the menu
3) See kopete (kdenetwork r792147) crash with the following bactrace:

Application: Kopete (kopete), signal SIGSEGV
Using host libthread_db library "/lib/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread 0xb5a806d0 (LWP 7402)]
[KCrash handler]
#6  0xb6b0ec29 in QString::isEmpty (this=0xbfe7f4ec)
    at /usr/include/qt4/QtCore/qstring.h:655
#7  0xb38fb201 in StatisticsContact::commonStatsSave (this=0x8407a30, 
    name=@0xbfe7f58c, statVar1=@0xbfe7f588, statVar2=@0xbfe7f584, 
    statVarChanged=true)
    at /var/tmp/portage/kde-base/kdenetwork-9999.4/work/kdenetwork-9999.4/kopete/plugins/statistics/statisticscontact.cpp:92
#8  0xb38fce2e in ~StatisticsContact (this=0x8407a30)
    at /var/tmp/portage/kde-base/kdenetwork-9999.4/work/kdenetwork-9999.4/kopete/plugins/statistics/statisticscontact.cpp:82
#9  0xb38edc4c in ~StatisticsPlugin (this=0x83e3198)
    at /var/tmp/portage/kde-base/kdenetwork-9999.4/work/kdenetwork-9999.4/kopete/plugins/statistics/statisticsplugin.cpp:99
#10 0xb7f00c1c in qDeleteInEventHandler (o=0xbfe7f4ec)
    at kernel/qobject.cpp:3580
#11 0xb7f02ea0 in QObject::event (this=0x83e3198, e=0x8398580)
    at kernel/qobject.cpp:1115
#12 0xb6d4e71f in QApplicationPrivate::notify_helper (this=0x80c3f10, 
    receiver=0x83e3198, e=0x8398580) at kernel/qapplication.cpp:3735
#13 0xb6d502fa in QApplication::notify (this=0xbfe7fcf8, receiver=0x83e3198, 
    e=0x8398580) at kernel/qapplication.cpp:3329
#14 0xb79517c3 in KApplication::notify (this=0xbfe7fcf8, receiver=0x83e3198, 
    event=0x8398580)
    at /var/tmp/portage/kde-base/kdelibs-9999.4/work/kdelibs-9999.4/kdeui/kernel/kapplication.cpp:311
#15 0xb7ef0cf7 in QCoreApplication::notifyInternal (this=0xbfe7fcf8, 
    receiver=0x83e3198, event=0x8398580) at kernel/qcoreapplication.cpp:586
#16 0xb7ef2059 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, 
    event_type=0, data=0x80ade80)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#17 0xb7f217a8 in QEventDispatcherUNIX::processEvents (this=0x80cbe40, 
    flags=@0xbfe7fbf8) at kernel/qeventdispatcher_unix.cpp:867
#18 0xb6de6cfe in QEventDispatcherX11::processEvents (this=0x80cbe40, 
    flags=@0xbfe7fc24) at kernel/qeventdispatcher_x11.cpp:154
#19 0xb7eefe61 in QEventLoop::processEvents (this=0xbfe7fc90, 
    flags=@0xbfe7fc58) at kernel/qeventloop.cpp:146
#20 0xb7eeff8f in QEventLoop::exec (this=0xbfe7fc90, flags=@0xbfe7fc98)
    at kernel/qeventloop.cpp:197
#21 0xb7ef2476 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:838
#22 0xb6d4de37 in QApplication::exec () at kernel/qapplication.cpp:3267
#23 0x08089f8c in main (argc=170524672, argv=0xd5083c)
    at /var/tmp/portage/kde-base/kdenetwork-9999.4/work/kdenetwork-9999.4/kopete/kopete/main.cpp:102
#24 0xb5e7dfdc in __libc_start_main (main=0x8087ff0 <main>, argc=1, 
    ubp_av=0xbfe800e4, init=0x809d120 <__libc_csu_init>, 
    fini=0x809d110 <__libc_csu_fini>, rtld_fini=0xb7ff0100 <_dl_fini>, 
    stack_end=0xbfe800dc) at libc-start.c:229
#25 0x08065101 in _start ()
#0  0xffffe410 in __kernel_vsyscall ()