Sketch 3.8 keeps crashing

Hi there,

Here are the steps I do to try to use this plugin, but it keeps crashing Sketch:
1. Open Sketch
2. Enable CSSketch (Plugins -> CSSketch -> Layout Layers)
3. Link .css file with just 1 class (.blue) (Plugins -> CSSketch -> Set Page's Stylesheet)
4. Select layer with classname .blue
5. Sketch crashes

Does anyone has the same issue?
What am I doing wrong?

Thanks for your help!