diff --git a/llm-complete-guide/steps/populate_index.py b/llm-complete-guide/steps/populate_index.py
index da926a5a..a6378d76 100644
--- a/llm-complete-guide/steps/populate_index.py
+++ b/llm-complete-guide/steps/populate_index.py
@@ -461,6 +461,9 @@ def draw_bar_chart(
     Returns:
         None
     """
+    if label is None:
+        label = ""
+
     max_value = max(data)
 
     bar_width = width // len(data)