Update app.py

app.py

@@ -235,6 +235,8 @@ def add_message(history, message):
     # history=[]
     global our_chatbot
     global chat_image_num
+    if not history:
+        history = []
     if len(history) == 0:
         our_chatbot = InferenceDemo(
             args, model_path, tokenizer, model, image_processor, context_len