diff --git a/tests/python_client/testcases/test_alias.py b/tests/python_client/testcases/test_alias.py
index 78b20537dd..8e881ec8d5 100644
--- a/tests/python_client/testcases/test_alias.py
+++ b/tests/python_client/testcases/test_alias.py
@@ -271,7 +271,7 @@ class TestAliasOperation(TestcaseBase):
         search_params = {"metric_type": "L2", "params": {"nprobe": 10}}
              
         query = [[random.random() for _ in range(ct.default_dim)] for _ in range(1)]
-        
+        alias_res = None
         try:
             alias_res = collection_alias.search(
                 query, "float_vector", search_params, topK,