fixed authentication

app.py

@@ -14,7 +14,10 @@ st.header("Powered by `LlamaIndex🦙` and `OpenAI API`")
 if "messages" not in st.session_state:
     st.session_state.messages = []
 
+index = None
+
 api_key = st.text_input("Enter your OpenAI API key here:", type="password")
+
 if api_key:
     resp = validate(api_key)
     if "error" in resp.json():
@@ -26,15 +29,16 @@ if api_key:
         index = create_index(bloom)
 
 st.write("---")
-input_text = st.text_area("Ask your question")
-
-if input_text is not None:
-    if st.button("Ask"):
-        st.session_state.messages.append(("User", input_text))
-        with st.spinner("Processing your query..."):
-            bot_response = get_response(index, input_text)
-        print("bot: ", bot_response)
-        st.session_state.messages.append(("Bot", bot_response))
+if index:
+    input_text = st.text_area("Ask your question")
+
+    if input_text:
+        if st.button("Ask"):
+            st.session_state.messages.append(("User", input_text))
+            with st.spinner("Processing your query..."):
+                bot_response = get_response(index, input_text)
+            print("bot: ", bot_response)
+            st.session_state.messages.append(("Bot", bot_response))
 
 # Display previous messages
 msg_key = 0