Crash on "Find usages"

To reproduce:
1) Open creator-master project inside creator
2) Open idocument.h
3) Do "Find usages" over setFilePath method. After all searches are displayed repeat "Find usages" over the same method. Crash.

Backtrace:
0 raise /lib64/libc.so.6 0x39776359e9
1 abort /lib64/libc.so.6 0x39776370f8
2 __libc_message /lib64/libc.so.6 0x3977675d17
3 _int_malloc /lib64/libc.so.6 0x397767e21c
4 malloc /lib64/libc.so.6 0x397768002c
5 operator new(unsigned long) /lib64/libstdc++.so.6 0x397f25edcd
6 QFile::QFile qfile.cpp 253 0x7ffff589145d
7 Utils::FileReader::fetch fileutils.cpp 311 0x7ffff78e1eb2
8 Utils::FileReader::fetch fileutils.cpp 328 0x7ffff78e21c9
9 Utils::FileReader::fetch fileutils.h 112 0x7ffff78e5488
10 Utils::readTextFile<QString> textfileformat.cpp 217 0x7ffff78e6157
11 Utils::TextFileFormat::readFile textfileformat.cpp 267 0x7ffff78e4a3f
12 getSource cppfindreferences.cpp 67 0x7fffe392684c
13 (anonymous namespace)::ProcessFile::operator() cppfindreferences.cpp 204 0x7fffe39275c2
14 QtConcurrent::MappedReducedKernel<QList<CPlusPlus::Usage>, QList<QString>::const_iterator, (anonymous namespace)::ProcessFile, (anonymous namespace)::UpdateUI, QtConcurrent::ReduceKernel<(anonymous namespace)::UpdateUI, QList<CPlusPlus::Usage>, QList<CPlusPlus::Usage> > >::runIterations qtconcurrentmapkernel.h 134 0x7fffe392cc81
15 QtConcurrent::IterateKernel<QList<QString>::const_iterator, QList<CPlusPlus::Usage> >::forThreadFunction qtconcurrentiteratekernel.h 230 0x7fffe3933ebb
16 QtConcurrent::IterateKernel<QList<QString>::const_iterator, QList<CPlusPlus::Usage> >::threadFunction qtconcurrentiteratekernel.h 192 0x7fffe3933518
17 QtConcurrent::ThreadEngineBase::run qtconcurrentthreadengine.cpp 264 0x7ffff691d394
18 QThreadPoolThread::run qthreadpool.cpp 100 0x7ffff56f8547
19 QThreadPrivate::start qthread_unix.cpp 345 0x7ffff56fe729
20 start_thread /lib64/libpthread.so.0 0x3977e07c53
21 clone /lib64/libc.so.6 0x39776f5dbd