diff --git a/executor/memtable_reader.go b/executor/memtable_reader.go
index 76ea478d91e71..f98306b5da51d 100644
--- a/executor/memtable_reader.go
+++ b/executor/memtable_reader.go
@@ -191,6 +191,9 @@ func fetchClusterConfig(sctx sessionctx.Context, nodeTypes, nodeAddrs set.String
 					url = fmt.Sprintf("%s://%s%s", util.InternalHTTPSchema(), statusAddr, pdapi.Config)
 				case "tikv", "tidb":
 					url = fmt.Sprintf("%s://%s/config", util.InternalHTTPSchema(), statusAddr)
+				case "tiflash":
+					// TODO: support show tiflash config once tiflash supports it
+					return
 				default:
 					ch <- result{err: errors.Errorf("unknown node type: %s(%s)", typ, address)}
 					return
diff --git a/executor/memtable_reader_test.go b/executor/memtable_reader_test.go
index 53607dd80ef03..5b55a9d601b03 100644
--- a/executor/memtable_reader_test.go
+++ b/executor/memtable_reader_test.go
@@ -170,7 +170,7 @@ func (s *testMemTableReaderSuite) TestTiDBClusterConfig(c *C) {
 
 	// mock servers
 	servers := []string{}
-	for _, typ := range []string{"tidb", "tikv", "pd"} {
+	for _, typ := range []string{"tidb", "tikv", "tiflash", "pd"} {
 		for _, server := range testServers {
 			servers = append(servers, strings.Join([]string{typ, server.address, server.address}, ","))
 		}