Error after update PromiseKit: Cannot convert value of type 'PMKFinalizer' to expected argument type 'Promise<Void>'

This code worked with PromiseKit v.4.5.2.

func getReminderIds(idArray: [Int]) {

    var reminderPromises: [Promise<Void>] = []

    for id in idArray {
        if let prom = self.delegate?.getReminders(id).then({ (reminderArray) -> Promise<Void> in
            Utils.logMessage("Reminders for asset \(id): \(reminderArray)")
            self.reminders[String(id)] = reminderArray
        }).catch({ (err) in
            self.reminders[String(id)] = nil
            Utils.logMessage("Error getting reminders for asset \(id): \(err)")
        }){

            reminderPromises.append(prom)
        }

    }

    _ = when(fulfilled: reminderPromises).done { results -> Void in
        self.collectionView?.refreshCollection(collection: 0)
    }

}

But after updating to PromiseKit v.6.8.4 I get the error "Cannot convert value of type 'PMKFinalizer' to expected argument type 'Promise'" in this line:

reminderPromises.append(prom)

struct Reminder {
    let id: Int
    let value: [String: Any]
}

func getReminderIds(idArray: [Int]) {

        var reminderPromises: [Promise<Reminder>] = []

        for id in idArray {
            reminderPromises.append(getReminders(id))
        }

        _ = when(fulfilled: reminderPromises).done { results -> Void in
            for item in results {
                print(item.id)
                print(item.value)
            }
        }

    }

    func getReminders(_ id: Int) -> Promise<Reminder> {
        // TODO network request or database request
        return Promise { $0.fulfill(Reminder(id: id, value: [:])) }
    }