diff --git a/tests/benchmark/milvus_benchmark/logs/log.py b/tests/benchmark/milvus_benchmark/logs/log.py
index 865e9a812a..d31a4e9504 100644
--- a/tests/benchmark/milvus_benchmark/logs/log.py
+++ b/tests/benchmark/milvus_benchmark/logs/log.py
@@ -25,6 +25,7 @@ def setup_logging(config_path=LOG_CONFIG_PATH, default_level=logging.INFO):
 
 class GlobalParams:
     log_file_path = FILE_NAME
+    metric = None
 
 
 global_params = GlobalParams()