NativeSubscribe unhandled error and suspected memory leak

When I use gRPC NativeSubscribe, it has a very high possibility to throw an exception saying "The mapper returned a null value" after receiving some messages.
Also it seems that there is memory leak, as memory usage goes from 500MB to 5GB in 8 hours.

Below is the related log:
> 2021-04-12 09:56:09.820 | WARN | ProduceLogs | No old message to produce removal messages for tx c63c87ae2b3652a517b56c4ab1980de347a6b77a3a3b3b01b5679cf6ae685b79 at block 68918fcfdd09dc59983bf7d7cc5fde966e48b1a3e6495f09f6c2c4338a0a0fb7
> 2021-04-12 09:56:09.822 | WARN | ProduceLogs | No old message to produce removal messages for tx 6949e37511d234a383b10657d911c853e63b17b16b8a8660e59a40d9b0a74810 at block 68918fcfdd09dc59983bf7d7cc5fde966e48b1a3e6495f09f6c2c4338a0a0fb7
> 2021-04-12 09:56:09.822 | WARN | ProduceLogs | No old message to produce removal messages for tx 439a04e3534868ba2cd2db7b947533e6babe1cc50a8c4597425bef2e75e00874 at block 68918fcfdd09dc59983bf7d7cc5fde966e48b1a3e6495f09f6c2c4338a0a0fb7
> 2021-04-12 09:56:09.823 | WARN | ProduceLogs | No old message to produce removal messages for tx 16ff748d6b710a92dd4007056652866028ae73bf986d0945a0238126c5a67555 at block 68918fcfdd09dc59983bf7d7cc5fde966e48b1a3e6495f09f6c2c4338a0a0fb7
> 2021-04-12 09:56:09.824 | WARN | ProduceLogs | No old message to produce removal messages for tx ab3848a17d9804ec2b6b409ec29188effe8bee98f0de208964f06612978c43e1 at block 68918fcfdd09dc59983bf7d7cc5fde966e48b1a3e6495f09f6c2c4338a0a0fb7
> 2021-04-12 09:56:09.830 | WARN | ProduceLogs | No old message to produce removal messages for tx 1450d655fa0a0e06c44fb48ba40b65d9cff6d41409d770a52bcda378a240d04d at block 68918fcfdd09dc59983bf7d7cc5fde966e48b1a3e6495f09f6c2c4338a0a0fb7
> 2021-04-12 09:56:09.845 | WARN | ProduceLogs | No old message to produce removal messages for tx 37dc07252b1149d38cf1f7360d7f97bb6d5496ee9df77dd6679dfd123fac50fe at block 68918fcfdd09dc59983bf7d7cc5fde966e48b1a3e6495f09f6c2c4338a0a0fb7
> 2021-04-12 09:56:09.847 | WARN | ProduceLogs | No old message to produce removal messages for tx fd79b1c8dc49d95e4eb9c4054bdffc58aebddbc9b1e3a39ce659861522ce0a92 at block 68918fcfdd09dc59983bf7d7cc5fde966e48b1a3e6495f09f6c2c4338a0a0fb7
> 2021-04-12 09:56:09.848 | WARN | ProduceLogs | No old message to produce removal messages for tx 4b5930fc7f3c6444a8a6579fbe4a0f3d470b3bdb6e743d16b3896a94f1c736ce at block 68918fcfdd09dc59983bf7d7cc5fde966e48b1a3e6495f09f6c2c4338a0a0fb7
> 2021-04-12 09:56:09.848 | WARN | ProduceLogs | No old message to produce removal messages for tx 23ff9d07d0025f94d17c3b5ec2ea53d007464c33f2118258932cdc5c581e3bed at block 68918fcfdd09dc59983bf7d7cc5fde966e48b1a3e6495f09f6c2c4338a0a0fb7
> 2021-04-12 09:56:09.854 | WARN | ProduceLogs | No old message to produce removal messages for tx 05b23068ae3347b043322a59fce558f98728567524a5de059e7f58b4b5e0298a at block 68918fcfdd09dc59983bf7d7cc5fde966e48b1a3e6495f09f6c2c4338a0a0fb7
> 2021-04-12 09:56:09.895 | WARN | NativeSubscribe | Unhandled error
> java.lang.NullPointerException: The mapper returned a null value.
> at java.util.Objects.requireNonNull(Objects.java:247) ~[?:?]
> at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:106) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:74) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.MonoNext$NextSubscriber.onNext(MonoNext.java:82) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.FluxFlatMap$FlatMapMain.tryEmit(FluxFlatMap.java:543) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.FluxFlatMap$FlatMapInner.onNext(FluxFlatMap.java:984) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:79) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.MonoPeekTerminal$MonoTerminalPeekSubscriber.onNext(MonoPeekTerminal.java:180) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.SerializedSubscriber.onNext(SerializedSubscriber.java:99) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.SerializedSubscriber.onNext(SerializedSubscriber.java:99) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.FluxTimeout$TimeoutMainSubscriber.onNext(FluxTimeout.java:180) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1816) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.MonoFlatMap$FlatMapInner.onNext(MonoFlatMap.java:249) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1816) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.MonoFlatMap$FlatMapInner.onNext(MonoFlatMap.java:249) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1816) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:151) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.FluxPeek$PeekSubscriber.onNext(FluxPeek.java:200) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:79) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:127) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.FluxPeekFuseable$PeekFuseableSubscriber.onNext(FluxPeekFuseable.java:210) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1816) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.MonoFlatMap$FlatMapInner.onNext(MonoFlatMap.java:249) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.Operators$MonoInnerProducerBase.complete(Operators.java:2664) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.MonoSingle$SingleSubscriber.onComplete(MonoSingle.java:180) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.MonoFlatMapMany$FlatMapManyInner.onComplete(MonoFlatMapMany.java:260) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.FluxDoFinally$DoFinallySubscriber.onComplete(FluxDoFinally.java:145) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.FluxHandle$HandleSubscriber.onComplete(FluxHandle.java:213) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.FluxMap$MapConditionalSubscriber.onComplete(FluxMap.java:269) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.FluxDoFinally$DoFinallySubscriber.onComplete(FluxDoFinally.java:145) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.FluxHandleFuseable$HandleFuseableSubscriber.onComplete(FluxHandleFuseable.java:229) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.FluxContextWrite$ContextWriteSubscriber.onComplete(FluxContextWrite.java:126) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1817) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.MonoCollectList$MonoCollectListSubscriber.onComplete(MonoCollectList.java:128) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.FluxPeek$PeekSubscriber.onComplete(FluxPeek.java:260) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:142) [reactor-core-3.4.10.jar:3.4.10]
> at reactor.netty.channel.FluxReceive.onInboundComplete(FluxReceive.java:400) [reactor-netty-core-1.0.11.jar:1.0.11]
> at reactor.netty.channel.ChannelOperations.onInboundComplete(ChannelOperations.java:419) [reactor-netty-core-1.0.11.jar:1.0.11]
> at reactor.netty.channel.ChannelOperations.terminate(ChannelOperations.java:473) [reactor-netty-core-1.0.11.jar:1.0.11]
> at reactor.netty.http.client.HttpClientOperations.onInboundNext(HttpClientOperations.java:684) [reactor-netty-http-1.0.11.jar:1.0.11]
> at reactor.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:93) [reactor-netty-core-1.0.11.jar:1.0.11]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-transport-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-transport-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) [netty-transport-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:436) [netty-transport-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:324) [netty-codec-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:296) [netty-codec-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:251) [netty-transport-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-transport-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-transport-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) [netty-transport-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1372) [netty-handler-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.handler.ssl.SslHandler.decodeNonJdkCompatible(SslHandler.java:1246) [netty-handler-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1286) [netty-handler-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:507) [netty-codec-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:446) [netty-codec-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276) [netty-codec-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-transport-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-transport-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) [netty-transport-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) [netty-transport-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-transport-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-transport-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) [netty-transport-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166) [netty-transport-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:719) [netty-transport-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655) [netty-transport-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581) [netty-transport-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493) [netty-transport-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986) [netty-common-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [netty-common-4.1.70.Final.jar:4.1.70.Final]
> at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) [netty-common-4.1.70.Final.jar:4.1.70.Final]
> at java.lang.Thread.run(Thread.java:830) [?:?]
> 2021-04-12 09:56:09.965 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.965 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.965 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.965 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.971 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.971 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.971 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.972 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.975 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.975 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.975 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.976 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.976 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.976 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.976 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.976 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.976 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.976 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.980 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.981 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.982 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.982 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.982 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.986 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.986 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.986 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.989 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.989 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.989 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.989 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.989 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.990 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.991 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.991 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.992 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.992 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.992 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.992 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.992 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:09.992 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.052 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.052 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.052 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.214 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.214 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.216 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.216 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.216 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.216 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.216 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.216 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.216 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.217 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.217 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.219 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.220 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.220 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.220 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.220 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.230 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.230 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.230 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.230 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.230 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.239 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.239 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.239 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.239 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.239 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.240 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.246 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.246 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.246 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.246 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.246 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.246 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.249 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.249 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.249 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.249 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.250 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.250 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.250 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.250 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.250 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.251 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.252 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.252 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.252 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.252 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER
> 2021-04-12 09:56:10.252 | WARN | WsFactory$EthereumWs | Failed to proceed with a RPC message: FAIL_ZERO_SUBSCRIBER