     # Display confirmation modal for sending emails invitation to attendees
     confirmEmailInvitations: (model, callback) ->
         invitationsShouldBeSent = model.isNew() or
-                                    model.startDateChanged() or
-                                        model.attendeesChanged()
+                                    model.startDateChanged or
+                                        model.attendeesChanged
         if not invitationsShouldBeSent
             callback null, false
             return

            return not guest.isSharedWithCozy and
                (model.isNew() or
                    guest.status is not 'ACCEPTED' or
                        model.startDateChanged())

        if guestsToInform.length
            guestsList = guestsToInform.map((guest) -> guest.label).join ', '

            .add endOffset, 'd'
            .format tFormat
        @$('.input-end-time').timepicker('setTime', newValue)
