QtCreator + FakeVim crashes when switching documents

QtCreator crashes when switching among open documents. How to reproduce:

1. Enable FakeVim.
2. Open at least two source files. Eg. you can create a new Qt application and then open mainwindow.cpp and mainwindow.h.
3. When editing the first file, press i to enter FakeVim's insert mode.
4. Press Ctrl+Tab to select another file.
5. FakeVim is still in insert mode. When pressing Escape, QtCreator crashes.

I am using Qt Creator 4.1 on Windows platform. Unfortunately I don't know how to attach the stderr, therefore I don't include any error messages from the console.