Update app.py

app.py

@@ -102,7 +102,10 @@ def generate_text(input_text, selected_model):
 # Define the chatbot function
 def generate_response(model_name, message, chat_history):
     model = load_model(model_name)
-    input_text = chat_history + " " + message
+    if chat_history:
+        input_text = chat_history + " " + message
+    else:
+        input_text = message
     response = model.generate(input_text, max_tokens=100)
     chat_history.append((message, response))
     return chat_history, response