Lyricsto conflict

[Bertalan Fodor]

Hello,

there is a strange thing when I use chordnames along with lyricsto and some
staff group.

Based on template/piano-lyrics.ly If I use chordnames like this:

\score { 
        << % added by me
  \context ChordNames { % added by me
          \chords { c } % added by me
  } % added by me
  \context GrandStaff <<
    \context Staff = upper {
        \context Voice = singer \upper
    }
    \lyricsto "singer" \new LyricsVoice \text
    \context Staff = lower <<
      \clef bass
      \lower
    >>  
  >>
  >> % added by me
  \paper {
    \translator {
      \GrandStaffContext
      \accepts "Lyrics"
    }
    \translator {
      %\LyricsVoiceContext
      \LyricsContext
      \consists "Bar_engraver"
    }
  }  
  \midi { }  
} 

I get very bad output (looks like parsing is ended at the first note) and
the messages:

Renamed input to
`/netrel/src/lilypond/input/template/piano-lyrics.ly'Interpreting
music...programming error: Skipped something?
Grob NoteHead ended before I expected it to end. (Continuing; cross thumbs)
programming error: Skipped something?
Grob Stem ended before I expected it to end. (Continuing; cross thumbs)
programming error: Skipped something?
Grob NoteHead ended before I expected it to end. (Continuing; cross thumbs)
programming error: Skipped something?
Grob Stem ended before I expected it to end. (Continuing; cross thumbs)

Bert