Your comments

Sorry but the log doesn't contain the error message. Are you sure that the error happened while the log was recorded? Can you reproduce the error? Thanks!
Released in 2.8.4
I see, thanks for the elaboration. In any way it should be an option, I wouldn't want my clipboard to be erased by me selecting something. Also I plan to do something different, but which would serve the same purpose. Now when you press Ctrl+Enter, CN inserts the whole text of the note into external application. I want CN to behave differently when some text in the note is highlighted. In this case it should display a menu allowing to select which highlighted text to insert. The option to insert the whole note body will be included as well however. Please note that under "hightlighted' I understand "Format/Highlight" (highlighting with yellow marker), not just plain selection.
Good, thanks for the suggestion! I'll close this one after final 2.8.4. release