programming error: Going back in MIDI time.

[Neil Puttock]

Hi there,

In the following snippet, beginning a sequence of music with a grace note
produces the above error at compile time when the \midi block is included,
though the midi output seems to be fine:

\version "2.11.32"
\score {
    \new Staff {
        \grace c'8
        c'1
    }
    \midi {}
}

Regards,
Neil