diff --git a/proto/errorcode/error_code_enums.proto b/proto/errorcode/error_code_enums.proto
index 67171642..a2e07b1b 100644
--- a/proto/errorcode/error_code_enums.proto
+++ b/proto/errorcode/error_code_enums.proto
@@ -502,4 +502,5 @@ enum Description {
   UNSUPPORTED_DEVICE_TYPE_AUTO = 168;
   UNSUPPORTED_DEVICE_TYPE_TV = 169;
   UNSUPPORTED_DEVICE_TYPE_WEAR = 170;
+  NULL_MESSAGE = 171;
 }