diff --git a/rdagent/scenarios/data_science/proposal/exp_gen.py b/rdagent/scenarios/data_science/proposal/exp_gen.py
index 99bb9afe..ea5531b5 100644
--- a/rdagent/scenarios/data_science/proposal/exp_gen.py
+++ b/rdagent/scenarios/data_science/proposal/exp_gen.py
@@ -218,7 +218,7 @@ class DSExpGen(ExpGen):
             )
         ):  # Assumption: when completing missing component, using component name as task name
             resp_dict["description"] = (
-                str(resp_dict.get("description"), "")
+                str(resp_dict.get("description", ""))
                 + f"\n\nYou have tried to implement the same component and got the following exception: \n{exp_and_feedback[1].exception}\n Please try different methods to avoid the same errors and results in an infinite loop"
             )