Something went wrong removing overlap

For some reason, I am getting a returning error pop up: “Something went wrong when removing overlap in glyph…”

I never got these errors, but since I updated Glyphsapp to 3.0.5 it happens all the time, also when exporting a font.
Any ideas how to fix this???

And it is always just one glyph… also very weird

Probably we need to fix this. Can you send us the file?