android.os.RemoteException：_caused by: android.os.remoteexception: remote stac

java.lang.NullPointerException:contexts[1] must not be null
android.os.Parcel.createException(Parcel.java:2080)
Caused by:android.os.RemoteException:Remote stack trace:
at com.android.internal.util.Preconditions.checkCollectionElementsNotNull(Preconditions.java:467)
at android.service.autofill.FillRequest.<init>(FillRequest.java:113)
at com.android.server.autofill.Session$1.onHandleAssistData(Session.java:385)
at com.android.server.wm.ActivityTaskManagerService.reportAssistContextExtras(ActivityTaskManagerService.java:3190)
at android.app.IActivityTaskManager$Stub.onTransact(IActivityTaskManager.java:2499)

线上bugly收到一个奇怪的crash，而且量还不少，并且没有具体的业务层面的堆栈信息，只能生撸系统源码定位问题了。

先贴一下错误日志：

06-11 19:26:31.042 11086 11086 E AndroidRuntime: FATAL EXCEPTION: main
15406-11 19:26:31.042 11086 11086 E AndroidRuntime: Process: com.text.client, PID: 11086
15506-11 19:26:31.042 11086 11086 E AndroidRuntime: java.lang.NullPointerException: contexts[1] must not be null
15606-11 19:26:31.042 11086 11086 E AndroidRuntime: at android.os.Parcel.createException(Parcel.java:2080)
15706-11 19:26:31.042 11086 11086 E AndroidRuntime: at android.os.Parcel.readException(Parcel.java:2042)
15806-11 19:26:31.042 11086 11086 E AndroidRuntime: at android.os.Parcel.readException(Parcel.java:1990)
15906-11 19:26:31.042 11086 11086 E AndroidRuntime: at android.app.IActivityTaskManager$Stub$Proxy.reportAssistContextExtras(IActivityTaskManager.java:5439)
16006-11 19:26:31.042 11086 11086 E AndroidRuntime: at android.app.ActivityThread.handleRequestAssistContextExtras(ActivityThread.java:3634)
16106-11 19:26:31.042 11086 11086 E AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2027)
16206-11 19:26:31.042 11086 11086 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:107)
16306-11 19:26:31.042 11086 11086 E AndroidRuntime: at android.os.Looper.loop(Looper.java:224)
16406-11 19:26:31.042 11086 110