.val file, .vit file and a screenshot of the error is attached. Open the .val file with the measurements. Try to draw a curved path: Curve tool menu -> click 'curved path' -> Click point 'HalsansatzVorne', then click point 'AusschnittSchulter'. The application displays a warning 'QPainterPath:lineTo: Adding point where x or y is NaN or Inf, ignoring call'. When the warning is OK'ed, the application crashes. In fact, this might be reproducible with any point. Drawing paths does not seem to be possible.
Issue #485 resolved