assistant from beta candidate crashes on ubuntu 12.04

(gdb) bt
#0 0x00007ffff394a445 in __GI_raise (sig=<optimized out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1 0x00007ffff394dbab in __GI_abort () at abort.c:91
#2 0x00007ffff3987e2e in __libc_message (do_abort=2, fmt=0x7ffff3a900d0 "*** glibc detected *** %s: %s: 0x%s ***\n") at ../sysdeps/unix/sysv/linux/libc_fatal.c:201
#3 0x00007ffff3992626 in malloc_printerr (action=3, str=0x7ffff3a8d1c3 "realloc(): invalid pointer", ptr=<optimized out>) at malloc.c:5007
#4 0x00007ffff39973ee in _GI__libc_realloc (oldmem=0x7ffff47c5320, bytes=32) at malloc.c:3019
#5 0x00007ffff428f156 in QListData::realloc(int) () from /home/sroedal/Qt5.0.0beta1/Desktop/Qt/5.0.0-beta1/gcc_64/bin/../lib/libQtCore.so.5
#6 0x00007ffff428f322 in QListData::prepend() () from /home/sroedal/Qt5.0.0beta1/Desktop/Qt/5.0.0-beta1/gcc_64/bin/../lib/libQtCore.so.5
#7 0x00007ffff442ce25 in QTextCodec::QTextCodec() () from /home/sroedal/Qt5.0.0beta1/Desktop/Qt/5.0.0-beta1/gcc_64/bin/../lib/libQtCore.so.5
#8 0x00007ffff4430ab9 in ?? () from /home/sroedal/Qt5.0.0beta1/Desktop/Qt/5.0.0-beta1/gcc_64/bin/../lib/libQtCore.so.5
#9 0x00007ffff4430f0d in ?? () from /home/sroedal/Qt5.0.0beta1/Desktop/Qt/5.0.0-beta1/gcc_64/bin/../lib/libQtCore.so.5
#10 0x00007ffff442c7d2 in QTextCodec::codecForLocale() () from /home/sroedal/Qt5.0.0beta1/Desktop/Qt/5.0.0-beta1/gcc_64/bin/../lib/libQtCore.so.5
#11 0x00007ffff42bc789 in QString::toLocal8Bit() const () from /home/sroedal/Qt5.0.0beta1/Desktop/Qt/5.0.0-beta1/gcc_64/bin/../lib/libQtCore.so.5
#12 0x00007ffff425fec2 in ?? () from /home/sroedal/Qt5.0.0beta1/Desktop/Qt/5.0.0-beta1/gcc_64/bin/../lib/libQtCore.so.5
#13 0x00007ffff425e14c in qt_message_output(QtMsgType, QMessageLogContext const&, QString const&) () from /home/sroedal/Qt5.0.0beta1/Desktop/Qt/5.0.0-beta1/gcc_64/bin/../lib/libQtCore.so.5
#14 0x00007ffff425e2af in ?? () from /home/sroedal/Qt5.0.0beta1/Desktop/Qt/5.0.0-beta1/gcc_64/bin/../lib/libQtCore.so.5
#15 0x00007ffff425e445 in QMessageLogger::fatal(char const*, ...) const () from /home/sroedal/Qt5.0.0beta1/Desktop/Qt/5.0.0-beta1/gcc_64/bin/../lib/libQtCore.so.5
#16 0x00007ffff43f16b5 in QMetaType::registerNormalizedType(QByteArray const&, void (void*), void* (void const*), void (void*), void* (void*, void const*), int, QFlags<QMetaType::TypeFlag>, QMetaObject const*) ()
from /home/sroedal/Qt5.0.0beta1/Desktop/Qt/5.0.0-beta1/gcc_64/bin/../lib/libQtCore.so.5
#17 0x00007ffff4a9cd9d in ?? () from /home/sroedal/Qt5.0.0beta1/Desktop/Qt/5.0.0-beta1/gcc_64/bin/../lib/libQtGui.so.5
#18 0x00007ffff4877309 in ?? () from /home/sroedal/Qt5.0.0beta1/Desktop/Qt/5.0.0-beta1/gcc_64/bin/../lib/libQtGui.so.5
#19 0x00007ffff7de9306 in call_init (l=<optimized out>, argc=1, argv=0x7fffffffdf68, env=0x7fffffffdf78) at dl-init.c:85
#20 0x00007ffff7de93df in call_init (env=<optimized out>, argv=<optimized out>, argc=<optimized out>, l=<optimized out>) at dl-init.c:52
#21 _dl_init (main_map=0x7ffff7ffe2c8, argc=1, argv=0x7fffffffdf68, env=0x7fffffffdf78) at dl-init.c:134
#22 0x00007ffff7ddb6ea in _dl_start_user () from /lib64/ld-linux-x86-64.so.2
#23 0x0000000000000001 in ?? ()
#24 0x00007fffffffe29f in ?? ()
#25 0x0000000000000000 in ?? ()