diff --git a/protocol/json/client_response.go b/protocol/json/client_response.go
index 165bd59..1f1843e 100644
--- a/protocol/json/client_response.go
+++ b/protocol/json/client_response.go
@@ -21,7 +21,7 @@ func newClientCodecResponse(raw json.RawMessage) (protocol.ClientCodecResponse,
 		releaseClientCodecResponse(ccr)
 		return nil, err
 	}
-	if 0 == ccr.response.ID {
+	if nil == ccr.response.ID {
 		releaseClientCodecResponse(ccr)
 		return nil, fmt.Errorf("This is not Response")
 	}