Font Selector Crash solved

The last weeks I lost some hours of work in Keynote to a strange crash in the font selector (Cmd-t). Clicking on the "Favorites" font collection relieably caused the crash of Keynote.app (08). The crash was also reproducible in Pages and Textedit.

Some trial and error lead me to the following solution: removing

/Library/FontCollections/com.apple.Favorites.collection

and restarting the application made Keynote like fonts again.