Update app.py

app.py

@@ -18,7 +18,8 @@ def format_prompt(message, history):
 
 def chat_inf(system_prompt,prompt,history):
     if not history:
-        history = []
+        history = [("","")]
+        
     seed = random.randint(1,1111111111111111)
     generate_kwargs = dict(
         temperature=0.9,