Update app.py

app.py

@@ -3,11 +3,14 @@ import gradio as gr
 import os
 
 # Set your OpenAI API key
-client = OpenAI(api_key=os.environ["APITOKEN"])
+client = OpenAI(api_key=os.getenv["APITOKEN"])
 
 greetings = ["hello", "hi", "hey", "greetings", "good morning", "good afternoon", "good evening"]
 
-def chatbot(input, conversation_history=[]):
+def chatbot(input, conversation_history=None):
+    if conversation_history is None:  # ✅ never use [] as a default
+        conversation_history = []
+        
     if input:
         # Check if the input starts with a common greeting, case-insensitive
         if any(input.lower().startswith(greet) for greet in greetings):