konqueror - pdf preview with kpdf crashes

Sometimes konqueror pdf preview with kpdf crashes.
this is the backtrace:

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Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
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[Thread debugging using libthread_db enabled]
[New Thread -1233286944 (LWP 5018)]
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[KCrash handler]
#6 0xffffe410 in __kernel_vsyscall ()
#7 0xb7c7adf0 in raise () from /lib/tls/i686/cmov/libc.so.6
#8 0xb7c7c641 in abort () from /lib/tls/i686/cmov/libc.so.6
#9 0xb7c7443b in __assert_fail () from /lib/tls/i686/cmov/libc.so.6
#10 0xb680f6ea in pthread_mutex_lock ()
   from /lib/tls/i686/cmov/libpthread.so.0
#11 0xb7d2cf26 in pthread_mutex_lock () from /lib/tls/i686/cmov/libc.so.6
#12 0xb527918b in GlobalParams::getErrQuiet () from /usr/lib/libpoppler.so.1
#13 0xb524bfd6 in error () from /usr/lib/libpoppler.so.1
#14 0xb52c7d29 in SecurityHandler::checkEncryption ()
   from /usr/lib/libpoppler.so.1
#15 0xb529f1d2 in PDFDoc::checkEncryption () from /usr/lib/libpoppler.so.1
#16 0xb529f32d in PDFDoc::setup () from /usr/lib/libpoppler.so.1
#17 0xb529f5cc in PDFDoc::PDFDoc () from /usr/lib/libpoppler.so.1
#18 0xb5361781 in Poppler::Document::load () from /usr/lib/libpoppler-qt.so.1
#19 0xb537e447 in KPdfPlugin::readInfo () from /usr/lib/kde3/kfile_pdf.so
#20 0xb7b2d17c in KFileMetaInfo::init () from /usr/lib/libkio.so.4
#21 0xb7b2d2b2 in KFileMetaInfo::KFileMetaInfo () from /usr/lib/libkio.so.4
#22 0xb7b2d377 in KFileItem::metaInfo () from /usr/lib/libkio.so.4
#23 0xb7b2d606 in KFileItem::getToolTipText () from /usr/lib/libkio.so.4
#24 0xb6556f4c in KonqFileTip::showTip () from /usr/lib/libkonq.so.4
#25 0xb65570d0 in KonqFileTip::qt_invoke () from /usr/lib/libkonq.so.4
#26 0xb71dd88b in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#27 0xb71de330 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#28 0xb756bba6 in QTimer::timeout () from /usr/lib/libqt-mt.so.3
#29 0xb7205596 in QTimer::event () from /usr/lib/libqt-mt.so.3
#30 0xb7174a60 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#31 0xb717688f in QApplication::notify () from /usr/lib/libqt-mt.so.3
#32 0xb787cce2 in KApplication::notify () from /usr/lib/libkdecore.so.4
#33 0xb71071e9 in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3
#34 0xb71674ab in QEventLoop::activateTimers () from /usr/lib/libqt-mt.so.3
#35 0xb711bd25 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#36 0xb718f136 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#37 0xb718ef46 in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#38 0xb7176609 in QApplication::exec () from /usr/lib/libqt-mt.so.3
#39 0xb6646ca4 in kdemain () from /usr/lib/libkdeinit_konqueror.so
#40 0xb668e464 in kdeinitmain () from /usr/lib/kde3/konqueror.so
#41 0x0804e6bf in ?? ()
#42 0x00000002 in ?? ()
#43 0x08087cf8 in ?? ()
#44 0x00000001 in ?? ()
#45 0x00000000 in ?? ()