Webkit-based application crashes when closing

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x0000000112cf21a0
0x000000010510c654 in QTextCodecCleanup::~QTextCodecCleanup (this=0x105b08010) at /Users/fabien/Qt/oslo-staging-1/src/corelib/codecs/qtextcodec.cpp:215
215	        delete *it;
(gdb) bt
#0  0x000000010510c654 in QTextCodecCleanup::~QTextCodecCleanup (this=0x105b08010) at /Users/fabien/Qt/oslo-staging-1/src/corelib/codecs/qtextcodec.cpp:215
#1  0x000000010524b3d5 in QGlobalStaticDeleter<QTextCodecCleanup>::~QGlobalStaticDeleter (this=0x1053da378) at qglobal.h:1818
#2  0x0000000105289fb1 in __tcf_1 () at /Users/fabien/Qt/oslo-staging-1/src/corelib/codecs/qtextcodec.cpp:226
#3  0x00000001056097f4 in __cxa_finalize ()
#4  0x000000010560970c in exit ()
#5  0x000000010000318f in start ()
Current language:  auto; currently c++

QTextCodecCleanup::~QTextCodecCleanup()
{
    if (!all)
        return;

#ifdef Q_DEBUG_TEXTCODEC
    destroying_is_ok = true;
#endif

    for (QList<QTextCodec *>::const_iterator it = all->constBegin()
            ; it != all->constEnd(); ++it) {
        delete *it; // <- crash
    }
    delete all;
    all = 0;
    localeMapper = 0;

#ifdef Q_DEBUG_TEXTCODEC
    destroying_is_ok = false;
#endif
}