HockeyApp 在提示应用启动并要求发送/删除崩溃日志时，在按下返回按钮时崩溃。ANullReferenceException发生在 HockeyApp 内部；堆栈跟踪已附加。
平台为 Windows Phone 8.1 RT，HockeyApp 版本为 2.2.2
如何在我的应用程序中解决此问题？
堆栈跟踪：
{
"contact": null,
"description": null,
"log": "Package: BuggyApp\nVersion: 1.1.0.0\nOS: Windows Phone\nWindows Phone: 8.1\nManufacturer: Microsoft\nModel: Virtual\nDate: 2015-09-07T10:29:41.6261178Z\nProduct-ID: 00000000-0000-0000-0000-000000000000
System.NullReferenceException: Object reference not set to an instance of an object.
at HockeyApp.CrashHandler.<AskUserForAgreementAsync>d__c.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at HockeyApp.CrashHandler.<HandleCrashesAsync>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at HockeyApp.HockeyClientExtensionsWinUniversal.<SendCrashesAsync>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at BuggyApp.App.<OnLaunched>d__e.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.AsyncMethodBuilderCore.<ThrowAsync>b__3(Object state)
at System.Threading.WinRTSynchronizationContext.Invoker.InvokeCore()",
"sdk": "HockeySDKWP81",
"sdk_version": "2.2.2",
"userID": null
}