diff --git a/chaos_genius/core/utils/round.py b/chaos_genius/core/utils/round.py
index 70905822..c8ac28e2 100644
--- a/chaos_genius/core/utils/round.py
+++ b/chaos_genius/core/utils/round.py
@@ -63,5 +63,5 @@ def round_column_in_df(df: pd.DataFrame, col: str):
                 ),
             ),
         ),
-        df[col]
+        None,
     )