diff --git a/src/main/kotlin/io/emeraldpay/dshackle/upstream/grpc/GrpcUpstreams.kt b/src/main/kotlin/io/emeraldpay/dshackle/upstream/grpc/GrpcUpstreams.kt
index bb01da3e..659a9cb5 100644
--- a/src/main/kotlin/io/emeraldpay/dshackle/upstream/grpc/GrpcUpstreams.kt
+++ b/src/main/kotlin/io/emeraldpay/dshackle/upstream/grpc/GrpcUpstreams.kt
@@ -21,6 +21,7 @@ import io.emeraldpay.api.proto.BlockchainOuterClass.DescribeRequest
 import io.emeraldpay.api.proto.BlockchainOuterClass.DescribeResponse
 import io.emeraldpay.api.proto.BlockchainOuterClass.StatusRequest
 import io.emeraldpay.api.proto.Common
+import io.emeraldpay.api.proto.Common.ChainRef.UNRECOGNIZED
 import io.emeraldpay.api.proto.ReactorBlockchainGrpc
 import io.emeraldpay.dshackle.BlockchainType
 import io.emeraldpay.dshackle.Chain
@@ -151,10 +152,15 @@ class GrpcUpstreams(
 
     private fun processDescription(value: DescribeResponse): Flux<UpstreamChangeEvent> {
         val chainNames = value.chainsList.map { it.chain.name }
+            .also {
+                if (it.contains("UNRECOGNIZED")) {
+                    log.warn("There is an UNRECOGNIZED chain, it's necessary to update dshackle-main")
+                }
+            }
         val version = value.buildInfo.version
         log.info("Start processing grpc upstream description for $id with chains $chainNames and version $version")
         val current = value.chainsList.filter {
-            Chain.byId(it.chain.number) != Chain.UNSPECIFIED
+            it.chain != UNRECOGNIZED && Chain.byId(it.chain.number) != Chain.UNSPECIFIED
         }.mapNotNull { chainDetails ->
             try {
                 val chain = Chain.byId(chainDetails.chain.number)