For some files script crashes with UTF-8 reading error. For me it happened at least for files: - https://github.com/wxWidgets/wxWidgets/blob/master/src/stc/scintilla/lexers/LexMatlab.cxx - https://github.com/wxWidgets/wxWidgets/blob/master/src/stc/scintilla/lexers/LexCSS.cxx Seems like the issue is in unicode symbols (like `Vrána`). Please handle them properly **Environment**: Docker `python:3.7` image Python 3.7