Version:           1.13.3
OS:                Linux

Hello, I have filter to spam, restore into the current folder, and try reply to it:
Application: KMail (kmail), signal: Segmentation fault
The current source language is "auto; currently asm".
[Current thread is 1 (Thread 0x7f30603b5780 (LWP 7642))]

Thread 2 (Thread 0x7f30465d2710 (LWP 7651)):
#0  0x00007f30587fb9e3 in select () at ../sysdeps/unix/syscall-template.S:82
#1  0x00007f305aab0b3c in QProcessManager::run (this=0x7f305adf5f20) at io/qprocess_unix.cpp:245
#2  0x00007f305a9cf075 in QThreadPrivate::start (arg=0x7f305adf5f20) at thread/qthread_unix.cpp:248
#3  0x00007f305a73b894 in start_thread (arg=<value optimized out>) at pthread_create.c:297
#4  0x00007f305880227d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115

Thread 1 (Thread 0x7f30603b5780 (LWP 7642)):
[KCrash Handler]
#5  0x00000000015e6a17 in ?? ()
#6  0x00007f305ee9bfc2 in KMCommand::slotStart (this=0x3898dd0) at /var/tmp/portage/kde-base/kmail-4.4.5/work/kmail-4.4.5/kmail/kmcommands.cpp:261
#7  0x00007f305ee93ea6 in KMCommand::qt_metacall (this=0x3898dd0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff333a09a0)
    at /var/tmp/portage/kde-base/kmail-4.4.5/work/kmail-4.4.5_build/kmail/kmcommands.moc:92
#8  0x00007f305aaeba6f in QMetaObject::activate (sender=0x1ce66c0, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x28ae8f8) at kernel/qobject.cpp:3285
#9  0x00007f305aaf3e5f in QSingleShotTimer::timerEvent (this=0x1ce66c0) at kernel/qtimer.cpp:308
#10 0x00007f305aae8463 in QObject::event (this=0x1ce66c0, e=0x1) at kernel/qobject.cpp:1204
#11 0x00007f3059bdc62c in QApplicationPrivate::notify_helper (this=0x1bbf320, receiver=0x1ce66c0, e=0x7fff333a1100) at kernel/qapplication.cpp:4300
#12 0x00007f3059be328b in QApplication::notify (this=0x7fff333a1570, receiver=0x1ce66c0, e=0x7fff333a1100) at kernel/qapplication.cpp:4183
#13 0x00007f305fdbcd76 in KApplication::notify (this=0x7fff333a1570, receiver=0x1ce66c0, event=0x7fff333a1100)
    at /var/tmp/portage/kde-base/kdelibs-4.4.5/work/kdelibs-4.4.5/kdeui/kernel/kapplication.cpp:302
#14 0x00007f305aad69cb in QCoreApplication::notifyInternal (this=0x7fff333a1570, receiver=0x1ce66c0, event=0x7fff333a1100) at kernel/qcoreapplication.cpp:704
#15 0x00007f305ab08292 in QCoreApplication::sendEvent (this=0x1bc2bc0) at kernel/qcoreapplication.h:215
#16 QTimerInfoList::activateTimers (this=0x1bc2bc0) at kernel/qeventdispatcher_unix.cpp:603
#17 0x00007f305ab04a54 in timerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#18 0x00007f305199d83f in g_main_dispatch (context=0x1bc1c40) at gmain.c:1960
#19 IA__g_main_context_dispatch (context=0x1bc1c40) at gmain.c:2513
#20 0x00007f30519a1bf8 in g_main_context_iterate (context=0x1bc1c40, block=<value optimized out>, dispatch=<value optimized out>, self=<value optimized out>) at gmain.c:2591
#21 0x00007f30519a1dac in IA__g_main_context_iteration (context=0x1bc1c40, may_block=1) at gmain.c:2654
#22 0x00007f305ab046b3 in QEventDispatcherGlib::processEvents (this=0x1bba250, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:412
#23 0x00007f3059c9c4ee in QGuiEventDispatcherGlib::processEvents (this=0x37b6cd0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#24 0x00007f305aad4e72 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#25 0x00007f305aad5314 in QEventLoop::exec (this=0x7fff333a13a0, flags=) at kernel/qeventloop.cpp:201
#26 0x00007f305aad973b in QCoreApplication::exec () at kernel/qcoreapplication.cpp:981
#27 0x0000000000403972 in main (argc=<value optimized out>, argv=<value optimized out>) at /var/tmp/portage/kde-base/kmail-4.4.5/work/kmail-4.4.5/kmail/main.cpp:156

Reproducible: Didn't try