Application: okular (0.20.3)
KDE Platform Version: 4.14.3 (Compiled from sources)
Qt Version: 4.8.6
Operating System: Linux 3.18.1-gentoo x86_64
Distribution: "Gentoo Base System release 2.2"

-- Information about the crash:
- What I was doing when the application crashed:

I opened a presentation in the pptx format. When I close Okular using the window close button it crashes.
It doesn't crash when viewing PDF files.

The crash can be reproduced every time.

-- Backtrace:
Application: Okular (okular), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[KCrash Handler]
#5  0x00007f93ba6e0475 in QHash<int, KoInlineObject*>::duplicateNode(QHashData::Node*, void*) () from /usr/lib64/libkotext.so.13
#6  0x00007f93cd6e03df in QHashData::detach_helper2(void (*)(QHashData::Node*, void*), void (*)(QHashData::Node*), int, int) () from /usr/lib64/qt4/libQtCore.so.4
#7  0x00007f93ba6e0bea in QHash<int, KoInlineObject*>::detach_helper() () from /usr/lib64/libkotext.so.13
#8  0x00007f93ba6e0c4d in QHash<int, KoInlineObject*>::remove(int const&) () from /usr/lib64/libkotext.so.13
#9  0x00007f93ba6df575 in KoInlineTextObjectManager::removeInlineObject(KoInlineObject*) () from /usr/lib64/libkotext.so.13
#10 0x00007f93ba6e43a7 in KoInlineObject::~KoInlineObject() () from /usr/lib64/libkotext.so.13
#11 0x00007f93ab657816 in PageVariable::~PageVariable() () from /usr/lib64/kde4/calligra_textinlineobject_variables.so
#12 0x00007f93cd7df308 in QObject::event(QEvent*) () from /usr/lib64/qt4/libQtCore.so.4
#13 0x00007f93ce1c66dc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#14 0x00007f93ce1ccc1d in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#15 0x00007f93ceec23fa in KApplication::notify(QObject*, QEvent*) () from /usr/lib64/libkdeui.so.5
#16 0x00007f93cd7c71bd in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/qt4/libQtCore.so.4
#17 0x00007f93cd7ca2dd in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib64/qt4/libQtCore.so.4
#18 0x00007f93cd7cb350 in QCoreApplication::exec() () from /usr/lib64/qt4/libQtCore.so.4
#19 0x0000000000409d50 in main ()

Reported using DrKonqi