Delete "ghost" glyph in glyph wndow

how do I delete multicolored ghost glyph in glyph window?

Can you show a screenshot?
It might be an empty emoji. You just add some paths to that glyph.

Thank you for your reply. I believe that the older outlines I had worked on in an earlier version of Glyphs were loath to depart. It appears that the problem is resolved.