diff --git a/pilot/commands/disply_type/show_chart_gen.py b/pilot/commands/disply_type/show_chart_gen.py
index 3fe1df2eb..09d450d29 100644
--- a/pilot/commands/disply_type/show_chart_gen.py
+++ b/pilot/commands/disply_type/show_chart_gen.py
@@ -155,6 +155,7 @@ def response_bar_chart(speak: str, df: DataFrame) -> str:
 
     fig, ax = plt.subplots(figsize=(8, 5), dpi=100)
 
+    hue = None
     x,y, non_num_columns, num_colmns =data_pre_classification(df)
     if len(non_num_columns) >= 1:
         hue = non_num_columns[0]