Crash on receive data

Hello, I got a crash on one test device

report from crashlytics
https://pastebin.com/yGTFtZpU

func urlSession(_ session: URLSession, dataTask: URLSessionDataTask, didReceive data: Data) {
            guard let loader = getLoader(with: dataTask) else { return }
40 ->>     loader.operative.receiveData.append(data)
}