\version "2.19.60"

up = { c'8\5 e'' ~ 2. }

down = { c'4\5 ~ 2. }

%{ uncomment this to trigger error
\layout {
  \context {
    \Voice
    \remove "New_fingering_engraver"
  }
  \context {
    \Staff
    \consists "New_fingering_engraver"
  }
}
%}

\score {
  \new Staff <<
     \new Voice { \voiceOne \up }
     \new Voice { \voiceTwo \down }
  >>
}