Update app.py

app.py

@@ -36,10 +36,13 @@ def chat_with_bot(message, history):
     )
 
     decoded = tokenizer.decode(outputs[0], skip_special_tokens=True)
+    # Extract assistant output after the prompt.
     response = decoded[len(prompt):].strip().split("\n")[0]
-    # IMPORTANT: Append message pair as a list rather than a tuple.
+    # Append the new conversation pair as a list of strings.
     history.append([message, response])
-    return response, history
+    # Ensure that every conversation pair is a list of strings.
+    safe_history = [[str(u), str(b)] for u, b in history]
+    return response, safe_history
 
 # Gradio ChatInterface expects fn(message, history) → (response, updated_history)
 gr.ChatInterface(