diff --git a/core/grpc_service.go b/core/grpc_service.go
index 3981aed..8678d87 100644
--- a/core/grpc_service.go
+++ b/core/grpc_service.go
@@ -116,6 +116,7 @@
 	intfid := packet.IntfId
 	rawpkt := gopacket.NewPacket(packet.Pkt, layers.LayerTypeEthernet, gopacket.Default)
 	if err := s.onuPacketOut(intfid, onuid, rawpkt); err != nil {
+		utils.LoggerWithOnu(onu).WithField("error", err).Errorf("OnuPacketOut Error ")
 		return new(openolt.Empty), err
 	}
 	return new(openolt.Empty), nil