Update app.py

app.py

@@ -25,6 +25,9 @@ def enhance_response(resp, message):
     return " ".join(resp.split()[:15])
 
 def chat(user_input, history):
+    if history is None:
+        history = []
+
     context = format_context(history) + f"You: {user_input}\n𝕴 𝖆𝖒 𝖍𝖎𝖒:"
     inputs = tokenizer.encode(context, return_tensors="pt", truncation=True, max_length=1024)