Update app.py

app.py

@@ -641,10 +641,9 @@ if len(chat_history) > max_history_pairs:
     chat_history = chat_history[-max_history_pairs:]
     # print(f"History truncated. Keeping last {len(chat_history)} turns.") # Debug print
 
-
 # Return the updated history state
-# This return statement is part of the 'respond' function
-return "", chat_history # Return empty string for the input box, and the updated history
+# This return statement MUST be inside the respond function definition
+    return "", chat_history # Return empty string for the input box, and the updated history
 
 # --- Gradio Interface ---