js error in StaffNotes.renderAnnotations

[maizy]

TypeError: Cannot read property 'annotation' of undefined
    at main.min.js:formatted:5986
    at NoteList.forEach (<anonymous>)
    at StaffNotes.renderAnnotations (main.min.js:formatted:5984)
    at StaffNotes.render (main.min.js:formatted:5864)
    at Ne (lib.min.js:1)
    at Bh (lib.min.js:1)
    at Lj (lib.min.js:1)
    at $h (lib.min.js:1)
    at Fj (lib.min.js:1)
    at We (lib.min.js:1)