[Bug]: NullPointerException: Null value passed for resolver parameter to ResolveListener.serviceResolved()

[phatblat]

What happened?

Got this report from a customer - I haven't been able to reproduce it myself yet. Somehow it appears that a null value is being passed to the serviceResolved() method of our anonymous ResolveListener implementation from the RxDNSSD library.

dnssd!!.resolve(flags, ifIndex, serviceName, regType, domain, object : ResolveListener {
    override fun serviceResolved(
        resolver: DNSSDService,
        flags: Int,
        ifIndex: Int,
        fullName: String,
        hostName: String,
        port: Int,
        txtRecord: Map<String, String>
    ) {
        doQuery(serviceName, ifIndex, hostName, port)
    }

    override fun operationFailed(service: DNSSDService, errorCode: Int) {
        DittoLog.d(TAG, "mDNS resolve failed: $errorCode")
    }
})

Version

0.9.15

What API do you use?

Bindable (recommended)

What device / emulator do you use?

Huawei P20

What Android API version is on your device?

29

Relevant log output

Fatal Exception: java.lang.NullPointerException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkNotNullParameter, parameter resolver
at live.ditto.transports.MdnsPlatform$doResolve$1.serviceResolved(:2)
at com.github.druk.dnssd.DNSSD$2.lambda$serviceResolved$0(DNSSD.java:240)
at com.github.druk.dnssd.DNSSD$2$$ExternalSyntheticLambda1.run(:16)
at android.os.Handler.handleCallback(Handler.java:888)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:213)
at android.app.ActivityThread.main(ActivityThread.java:8178)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1101)

Could you reproduce this issue in samples?

• Yes, I can reproduce this issue in sample app of this repo?
• Yes, I can reproduce this issue in Bonjour Browser?