模拟器API29上的NullPointerException

Question

我在我的应用程序上运行了一个快照，该快照可以在带有API27的Samsung S8和Pixel Emulator上完美运行。但是，当在Nexus 5x模拟器API29上运行它时，在粗体突出显示的行上出现了空点异常（我听说它很容易在代码内轻松看到出现错误的地方）。

val deal_num = document.getLong（“ deal_num”）!!

 docref.collection("winning_bid").whereEqualTo("previous_seller_id",userid).addSnapshotListener{value, task->

        if(value !=null){
            for (document in value!!){

                val losing_seller = document.getString("previous_seller_id")
                val deal_num = document.getLong("deal_num")!!

                if(userid == losing_seller) {

                    LosingBidNotificationChannel()

                    val CHANNEL_ID = "Losing Bid"

                    val intent = Intent(this, Mydeals_seller::class.java).apply {
                        flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
                    }

                    val pendingIntent = PendingIntent.getActivity(this, 0, intent, 0)

                    val builder = NotificationCompat.Builder(this, CHANNEL_ID)
                        .setSmallIcon(R.drawable.openbidicon)
                        .setContentTitle("OpenBid")
                        .setContentText("Your bid has lost the lead")
                        .setStyle(
                            NotificationCompat.BigTextStyle()
                                .bigText("Your bid is no longer leading for Deal #${deal_num}")
                        )
                        .setPriority(NotificationCompat.PRIORITY_HIGH)
                        .setContentIntent(pendingIntent)
                        .setChannelId(CHANNEL_ID)
                        .setAutoCancel(true)
                        .build()

                    with(NotificationManagerCompat.from(this)) {

                        notify(id, builder)
                        id++
                    }
                }
            }
        }
    }

是否有任何理由为什么会在API 29上返回NullPointerException但在其他设备上运行正常？

enter image description here

Error in Logcat

Code for Line 382

Code for Line 38

Logcat for testing the userid

code for pulling userid

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我发现了错误。我删除了模拟器并重新安装了它，现在一切似乎都可以正常工作。

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