java.lang.IllegalArgumentException Label cannot be null

[helloalbin]

Getting the following exception in the console when there is a 404 error

{"statusCode":404,"code":"ERR10007","message":"INVALID_REQUEST_PATH","description":"Request path /test cannot be found in the spec.","severity":"ERROR"}
2021-10-06 10:35:15 IST [XNIO-1 task-1] ERROR [] [] Exception:
java.lang.IllegalArgumentException: Label cannot be null.
	at io.prometheus.client.SimpleCollector.labels(SimpleCollector.java:68)
	at com.networknt.metrics.prometheus.PrometheusHandler.lambda$handleRequest$1(PrometheusHandler.java:103)
	at io.undertow.server.HttpServerExchange.invokeExchangeCompleteListeners(HttpServerExchange.java:1350)
	at io.undertow.server.HttpServerExchange.terminateResponse(HttpServerExchange.java:1637)
	at io.undertow.server.Connectors.terminateResponse(Connectors.java:176)
	at io.undertow.server.protocol.http.ServerFixedLengthStreamSinkConduit.channelFinished(ServerFixedLengthStreamSinkConduit.java:58)
	at io.undertow.conduits.AbstractFixedLengthStreamSinkConduit.exitFlush(AbstractFixedLengthStreamSinkConduit.java:316)
	at io.undertow.conduits.AbstractFixedLengthStreamSinkConduit.flush(AbstractFixedLengthStreamSinkConduit.java:234)
	at org.xnio.conduits.ConduitStreamSinkChannel.flush(ConduitStreamSinkChannel.java:162)
	at io.undertow.channels.DetachableStreamSinkChannel.flush(DetachableStreamSinkChannel.java:119)
	at io.undertow.io.AsyncSenderImpl.close(AsyncSenderImpl.java:376)
	at io.undertow.io.DefaultIoCallback.onComplete(DefaultIoCallback.java:54)
	at io.undertow.io.AsyncSenderImpl.invokeOnComplete(AsyncSenderImpl.java:435)
	at io.undertow.io.AsyncSenderImpl.send(AsyncSenderImpl.java:262)
	at io.undertow.io.AsyncSenderImpl.send(AsyncSenderImpl.java:348)
	at io.undertow.io.AsyncSenderImpl.send(AsyncSenderImpl.java:316)
	at io.undertow.io.AsyncSenderImpl.send(AsyncSenderImpl.java:354)
	at com.networknt.handler.LightHttpHandler.setExchangeStatus(LightHttpHandler.java:139)
	at com.networknt.handler.LightHttpHandler.setExchangeStatus(LightHttpHandler.java:73)
	at com.networknt.openapi.OpenApiHandler.handleRequest(OpenApiHandler.java:99)
	at com.networknt.handler.Handler.next(Handler.java:212)
	at com.networknt.handler.Handler.next(Handler.java:233)
	at com.networknt.correlation.CorrelationHandler.handleRequest(CorrelationHandler.java:77)
	at com.networknt.handler.Handler.next(Handler.java:212)
	at com.networknt.handler.Handler.next(Handler.java:233)
	at com.networknt.traceability.TraceabilityHandler.handleRequest(TraceabilityHandler.java:68)
	at com.networknt.handler.Handler.next(Handler.java:212)
	at com.networknt.handler.Handler.next(Handler.java:233)
	at com.networknt.metrics.prometheus.PrometheusHandler.handleRequest(PrometheusHandler.java:114)
	at com.networknt.handler.Handler.next(Handler.java:212)
	at com.networknt.handler.Handler.next(Handler.java:233)
	at com.networknt.exception.ExceptionHandler.handleRequest(ExceptionHandler.java:76)
	at io.undertow.server.Connectors.executeRootHandler(Connectors.java:387)
	at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:852)
	at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
	at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:2019)
	at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1558)
	at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1449)
	at org.xnio.XnioWorker$WorkerThreadFactory$1$1.run(XnioWorker.java:1280)
	at java.base/java.lang.Thread.run(Thread.java:833)

[helloalbin]

Pull request 1040

[stevehu]

java.lang.IllegalArgumentException Label cannot be null light-4j master