IBAction导致AppDelegate中的EXC_BAD_ACCESS

我正在使用DJI Mobile SDK和UXSDK示例应用程序（在这里找到：https://github.com/dji-sdk/Mobile-UXSDK-iOS）在swift中编写iOS项目 .

我添加了一个带有IBAction getData（_ sender :)的ViewController，它成功地向DJI产品发送消息 . 当IBAction完成时，应用程序崩溃并在AppDelegate.swift中出现EXC_BAD_ACCESS错误

AppDelegate中的错误标志

import UIKit
import Foundation

//To use DJI Bridge app, change `useBridge` to true and add bridge app 
IP address in `debugID`
let useBridge = false
let debugIP = "BRIDGE_APP_IP_ADDRESS_HERE"


@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, 
UISplitViewControllerDelegate {

var window: UIWindow?

open var productCommunicationManager = ProductCommunicationManager()
open var communicationsViewController = CommunicationsViewController()
open var osdkDevice:OnboardSDKDevice?

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    // Start the registration at the launch of the app. This can be retriggered at anytime from the main view.
    // DJI App key needs to be registered in the Info.plist before calling this method.
    self.productCommunicationManager.registerWithProduct()
    return true
    }

}

这是视图控制器 . 它不是主要的，但它通过主视图控制器导航 .

import UIKit
    import Foundation
    import DJISDK
    import DJIUXSDK

    class CommunicationsViewController: UIViewController, UITextViewDelegate {

    //This is instantiated as a UIViewController as soon as app launches
    //The reference in appDelegate is reassigned every time the view launches

    //MARK: Properties
    @IBOutlet weak var DataDisplay: UITextView!
    open weak var appDelegate = UIApplication.shared.delegate as? AppDelegate

    //MARK: Methods
    override func viewDidLoad() {
        super.viewDidLoad()
        appDelegate?.communicationsViewController = self
        appDelegate?.productCommunicationManager.connectToProduct()
        appDelegate?.productCommunicationManager.connectedProduct = DJISDKManager.product()
        if (appDelegate?.productCommunicationManager.connectedProduct?.model != nil){
            self.DataDisplay.text = (appDelegate?.productCommunicationManager.connectedProduct.model)
        }
        appDelegate?.osdkDevice = OnboardSDKDevice()
        appDelegate?.osdkDevice?.delegate = appDelegate?.osdkDevice

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    //MARK: Actions
    @IBAction func back(_ sender: UIButton) {
        self.dismiss(animated: true, completion: nil)
    }


    @IBAction func getData(_ sender: UIButton) {
        //Create 4 bytes of 0's
        let data = Data(count: 4)
        appDelegate?.osdkDevice?.sendDataFromMobile(toOnboard: data, withCompletion: nil)
        //App crashes after exiting scope
    }

}

我发现EXC_BAD_ACCESS是由尝试访问不再可用的内存引起的 . 我仔细检查了所有IBActions和IBOutlets的连接，它们似乎没问题 .

这是来自控制台

的"bt"的错误消息

异常断点的控制台和程序集

有人可以帮我诊断崩溃吗？ iOS编程和Swift对我来说都是新手，所以如果这个描述中有任何遗漏，请告诉我 . 谢谢