Kotlin 奇怪的 cotlin check Not Null 参数错误

我们在Firebase上收到了kotlin方法的崩溃:

Fatal Exception: java.lang.NullPointerException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkNotNullParameter, parameter code
       at [redacted].DeliveryMethod.<init>(:2)
       at [redacted].DeliveryMethodsUpdater$addSingleDMInAd$clientCall$1.invokeSuspend(DeliveryMethodsUpdater.kt:121)
       at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
       at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
       at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:571)
       at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:738)
       at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:678)
       at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:665)

模型是这样的:

class DeliveryMethod() {
    lateinit var code: String
    lateinit var name: String
    lateinit var description: String

var isAddressRequired: Boolean? = null
var image: JSONObject? = null
var isDefault: Boolean = false

constructor(code: String) : this() {
    this.code = code
}

constructor(code: String, name: String, description: String, image: JSONObject? = null) : this() {
    this.code = code
    this.name = name
    this.description = description
    this.image = image
}
}

方法是:

private suspend fun addSingleDMInAd(
        adId: Long,
        deliveryMethodCode: String
    ): JoinAdDeliveryMethod? {
        var addedDeliveryMethod: JoinAdDeliveryMethod? = null
        val clientCall = GlobalScope.async(Dispatchers.IO) {
            val cd = CountDownLatch(1)
            Client.getInstance().addDeliveryMethodInAd(
                adId,
                DeliveryMethod(deliveryMethodCode),
                object : NetworkCallback<JoinAdDeliveryMethod> {
                    override fun onSuccess(result: JoinAdDeliveryMethod) {
                        addedDeliveryMethod = result
                        cd.countDown()
                    }

                    override fun onFailure(err: NetworkError?) {
                        addedDeliveryMethod = null
                        cd.countDown()
                    }
                }
            )
            cd.await()
        }
        clientCall.await()
        return addedDeliveryMethod
    }

现在，我知道DeliveryMethod的构造函数被code的null值调用，但我不明白为什么这个异常只在此时出现.如您所见，方法param和以前的方法也被标记为非null.在调用DeliveryMethod的构造函数之前，是否应该抛出异常？