Qt Creator crashed when replacing string and preserving case

Say, if I have a file:
cat test_replace.cpp

MYMACRO

MYMACRO
MYMACRO
MYMACRO
MYMACRO
MYMACRO
MYMACRO
MYMACRO

Then I block select all of those lines and do a replace 'MYMACRO' with 'MYMACROS', with the 'preserve case' option active I get a crash:

ASSERT: "uint < uint(size())" in file /opt/Qt/5/include/QtCore/qstring.h, line 729

#0 0xb7829430 in __kernel_vsyscall ()
#1 0xb6383651 in raise () from /lib/tls/i686/cmov/libc.so.6
#2 0xb6386a82 in abort () from /lib/tls/i686/cmov/libc.so.6
#3 0xb6772f24 in ?? () from /opt/qt/5.0.0/gcc/lib/libQt5Core.so.5
#4 0xb6770f54 in QMessageLogger::fatal(char const*, ...) const () from /opt/qt/5.0.0/gcc/lib/libQt5Core.so.5
#5 0xb676c7b9 in qt_assert(char const*, char const*, int) () from /opt/qt/5.0.0/gcc/lib/libQt5Core.so.5
#6 0xb37915e3 in QString::at (this=0xbfadeae8, i=7) at /opt/Qt/5/include/QtCore/qstring.h:729
#7 0xb37a2a3a in Utils::matchCaseReplacement (originalText=..., replaceText=...) at ../../../../qt-creator/src/libs/utils/filesearch.cpp:401
#8 0xb2621815 in Find::BaseTextFind::replaceAll (this=0xaac07180, before=..., after=..., findFlags=...) at ../../../../qt-creator/src/plugins/find/basetextfind.cpp:293
#9 0xb261e710 in Find::Internal::CurrentDocumentFind::replaceAll (this=0x89c56d8, before=..., after=..., findFlags=...)
at ../../../../qt-creator/src/plugins/find/currentdocumentfind.cpp:139
#10 0xb262a860 in Find::Internal::FindToolBar::invokeReplaceAll (this=0x89c5808) at ../../../../qt-creator/src/plugins/find/findtoolbar.cpp:512
#11 0xb264c852 in Find::Internal::FindToolBar::qt_static_metacall (_o=0x89c5808, _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0xbfaded08)
at .moc/debug-shared/moc_findtoolbar.cpp:176
#12 0xb698ef3b in QMetaObject::activate(QObject*, int, int, void**) () from /opt/qt/5.0.0/gcc/lib/libQt5Core.so.5
#13 0xb698e810 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /opt/qt/5.0.0/gcc/lib/libQt5Core.so.5