\key\default crashes midi output

Saul Tobin <[email protected]>
Newsgroups gmane.comp.gnu.lilypond.bugs
Message-ID <CAPF+3FGABg+xZ4k1wfrRNgRfnDtuy_EaygZ4oMtgLcRSzZtkaA@mail.gmail.com> 
\version "2.24.0"

\score {
  \new Staff {
    \key f \major
    c'1
    \key \default
    c'1
  }
  \midi {}
}

This crashes with "In procedure cdar: Wrong type (expecting pair): ()" as
far back as 2.14.2.
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