Files in project cannot be opened while Qt Creator is indexing

Hi, while Qt Creator is indexing project, you can't open any files from project in Qt Creator. You can only see mouse hourglass.
When indexing status bar starts all over again from beginning, then file opens.

Also, related to this, when you close the file you opened from project, you can see this error message in terminal:
ASSERTION it != d->m_states.end() FAILED AT /a/b/c/d/teeharju/qt-creator-2.0.0-alpha1-src/src/plugins/coreplugin/filemanager.cpp:276

This is reproduciable and happens every time you open+close some file in project.