Crash while performing custom operation in didRegisterForRemoteNotification - ios

Question

The crash that has occurred is :-
Crashed: com.apple.main-thread
EXC_BREAKPOINT 0x00000001004c6514
Here is the stack race for the crash :-
Crashed: com.apple.main-thread
0 Quickride 0x1004c6514 specialized static HttpUtils.putJSONRequestWithBody(url:targetViewController:handler:body:) (HttpUtils.swift:173)
1 Quickride 0x100464958 specialized static UserRestClient.saveDeviceToken(targetViewController:requestBody:completionHandler:) (UserRestClient.swift:421)
2 Quickride 0x100746da8 DeviceRegistrationHelper.registerDeviceTokenWithQRServer() (DeviceRegistrationHelper.swift:33)
3 Quickride 0x1007fef14 specialized AppDelegate.application(_:didRegisterForRemoteNotificationsWithDeviceToken:) (AppDelegate.swift:315)
4 Quickride 0x1007f3714 #objc AppDelegate.application(_:didRegisterForRemoteNotificationsWithDeviceToken:) (AppDelegate.swift)
5 FBSDKCoreKit 0x101b350f4 fb_swizzledMethod_4 + 140
6 libdispatch.dylib 0x2284a56c8 _dispatch_call_block_and_release + 24
7 libdispatch.dylib 0x2284a6484 _dispatch_client_callout + 16
8 libdispatch.dylib 0x2284529b4 _dispatch_main_queue_callback_4CF$VARIANT$mp + 1068
9 CoreFoundation 0x2289fbdd0 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12
10 CoreFoundation 0x2289f6c98 __CFRunLoopRun + 1964
11 CoreFoundation 0x2289f61cc CFRunLoopRunSpecific + 436
12 GraphicsServices 0x22ac6d584 GSEventRunModal + 100
13 UIKitCore 0x255af1054 UIApplicationMain + 212
14 Quickride 0x10043568c main (AppDelegate.swift:29)
15 libdyld.dylib 0x2284b6bb4 start + 4
The code where the crash had occurred is :-
static func putJSONRequestWithBody(url: String, targetViewController: UIViewController?, handler: #escaping RiderRideRestClient.responseJSONCompletionHandler,body : Dictionary<String, String>){
AppDelegate.getAppDelegate().log.debug("")
var authHeader = [String: String]()
if SharedPreferenceHelper.getJWTAuthenticationToken() != nil{
authHeader[Authorization] = SharedPreferenceHelper.getJWTAuthenticationToken()!
}
}
Here is the code for the app delegate didRegisterForremoteNotification from whre the above part of code is called internally :-
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
AppDelegate.getAppDelegate().log.debug("")
let deviceTokenString = deviceToken.map { String(format: "%02.2hhx", $0) }.joined()
AppDelegate.getAppDelegate().log.debug("\(deviceTokenString)")
userDefaults.setValue(deviceTokenString, forKey: "deviceTokenString")
let phone = QRSessionManager.getInstance()?.getUserId()
if phone != nil && (phone!.count) > 1 && deviceTokenString != nil && !deviceTokenString.isEmpty{
DeviceRegistrationHelper(sourceViewController: nil, phone: phone!, deviceToken: deviceTokenString).registerDeviceTokenWithQRServer()
}
}