Segmentation fault in cpptools plugin

Hi! I have a custom plugin to display Sphinx rst files (https://github.com/procitec/qtcreator-sphinx-plugin).

Working with the texteditor seems to work fine. Sometimes if i have the QtCreator window in background and click on it to raise it to the top, i get a segfault.

Attached is the backtrace. Seems that the clangcodemodel (why is this active for my editor?) seems to have trouble by either

1) Having a valid instance to my editor or

2) Having a valid context for my editor.

The same crash seems also to occure on QtCreator exit sometimes.

Any hints to determine if this is a problem of my plugin or maybe this is due to a (for sure) invalid clang /llvm configuration?

Should (and how) can i disable the clang for my specific editor/mime-types?