Sword 0.9.2 crashes if connection is down

[scalatron]

Condition: WiFi connected, but internet unreachable.
Crashes in Request.swift line 125:

    let task = self.session.dataTask(with: request) {
      [unowned self, unowned sema] data, response, error in
      
      let response = response as! HTTPURLResponse       // <<<< crash
      let headers = response.allHeaderFields
    ...

because response is nil.