Uncaught TypeError: Cannot read property 'getAbsoluteTimestamp' of undefined

[Jack-Works]

e.Compare = function(t, e) {
    var n = l.Fraction.minus(t.staffEntries[t.staffEntries.length - 1].getAbsoluteTimestamp(), t.staffEntries[0].getAbsoluteTimestamp())
                                                                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    , i = l.Fraction.minus(e.staffEntries[e.staffEntries.length - 1].getAbsoluteTimestamp(), e.staffEntries[0].getAbsoluteTimestamp());
     return n.RealValue > i.RealValue ? 1 : i.RealValue > n.RealValue ? -1 : 0
}

Error stack:

Uncaught TypeError: Cannot read property 'getAbsoluteTimestamp' of undefined
    at e.Compare (opensheetmusicdisplay@0.7.3:15)
    at Array.sort (<anonymous>)
    at e.calculateSlurs (opensheetmusicdisplay@0.7.3:15)
    at e.t.calculateMusicSystems (opensheetmusicdisplay@0.7.3:8)
    at e.t.calculate (opensheetmusicdisplay@0.7.3:8)
    at t.reCalculate (opensheetmusicdisplay@0.7.3:15)
    at t.render (opensheetmusicdisplay@0.7.3:15)
    at opensheetmusicdisplay@0.7.3:15

When try to render Piano Sonata No. 14 in C♯ minor (“Moonlight”) (it's a public sheet, free to download)

[sschmidTU]

Fixed, will be released in OSMD 0.7.4a soon.
The moonlight sonata sample renders now.