Exception: "null cannot be cast to non-null type java.util.HashMap" while sending event with null arguments

[mahdinba97]

Hi. thank you for the great package.
I have a custom event function which calls the recordCustomEvent function of NewRelicMobile, and I get this exception when the eventAttributes map is null.

E/MethodChannel#newrelic_mobile( 5164): java.lang.NullPointerException: null cannot be cast to non-null type java.util.HashMap<*, *>{ kotlin.collections.TypeAliasesKt.HashMap<*, *> }
E/MethodChannel#newrelic_mobile( 5164): 	at com.newrelic.newrelic_mobile.NewrelicMobilePlugin.onMethodCall(NewrelicMobilePlugin.kt:141)
E/MethodChannel#newrelic_mobile( 5164): 	at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:267)
E/MethodChannel#newrelic_mobile( 5164): 	at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler(DartMessenger.java:292)
E/MethodChannel#newrelic_mobile( 5164): 	at io.flutter.embedding.engine.dart.DartMessenger.lambda$dispatchMessageToQueue$0$io-flutter-embedding-engine-dart-DartMessenger(DartMessenger.java:319)
E/MethodChannel#newrelic_mobile( 5164): 	at io.flutter.embedding.engine.dart.DartMessenger$$ExternalSyntheticLambda0.run(Unknown Source:12)
E/MethodChannel#newrelic_mobile( 5164): 	at android.os.Handler.handleCallback(Handler.java:942)
E/MethodChannel#newrelic_mobile( 5164): 	at android.os.Handler.dispatchMessage(Handler.java:99)
E/MethodChannel#newrelic_mobile( 5164): 	at android.os.Looper.loopOnce(Looper.java:201)
E/MethodChannel#newrelic_mobile( 5164): 	at android.os.Looper.loop(Looper.java:288)
E/MethodChannel#newrelic_mobile( 5164): 	at android.app.ActivityThread.main(ActivityThread.java:7918)
E/MethodChannel#newrelic_mobile( 5164): 	at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#newrelic_mobile( 5164): 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
E/MethodChannel#newrelic_mobile( 5164): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)

I believe this is the line of the plugin native code which causes this exception:

// NewrelicMobilePlugin.kt
"recordCustomEvent" -> {
                val eventType: String? = call.argument("eventType")
                val eventName: String? = call.argument("eventName")
                val eventAttributes: HashMap<String, Any>? = call.argument("eventAttributes")

                val copyOfEventAttributes = eventAttributes?.clone() as HashMap<*, *>; //  <--  causing exception
                for (key in  copyOfEventAttributes.keys)  {
                    val value = copyOfEventAttributes[key]
                    if(value is HashMap<*, *>) {
                        for (k in value.keys) {
                            value[k]?.let { eventAttributes.put(k as String, it) };
                        }
                        eventAttributes.remove(key)
                    }
                }
                val eventRecorded =
                    NewRelic.recordCustomEvent(eventType, eventName, eventAttributes)
                result.success(eventRecorded)
            }

here is my code:

static final _newRelic = NewrelicMobile.instance;

//...

static Future<bool> sendEvent({
  required NewRelicEventType eventType,
  String eventName = '',
  Map<String, dynamic>? eventAttributes,
}) {
  return _newRelic.recordCustomEvent(
    eventType.toString(),
    eventName: eventName,
    eventAttributes: eventAttributes,
  );
}

My environment is:
Flutter 3.16.9
NewRelicMobile 1.0.2
agent-gradle-plugin 6.5.0

[ndesai-newrelic]

@mahdinba97 we will fix it for next release.