diff --git a/lib/db.c b/lib/db.c
index 320611d168..e03da0654b 100644
--- a/lib/db.c
+++ b/lib/db.c
@@ -13559,6 +13559,7 @@ grn_load_(grn_ctx *ctx, grn_content_type input_type,
   case GRN_CONTENT_MSGPACK :
   case GRN_CONTENT_GROONGA_COMMAND_LIST :
     ERR(GRN_FUNCTION_NOT_IMPLEMENTED, "unsupported input_type");
+    loader->stat = GRN_LOADER_END;
     // todo
     break;
   }