Update app.py

app.py

@@ -43,7 +43,7 @@ def extract_track_id_from_url(url):
 def app():
 
     # Step 1: User Authorization
-    if st.session_state.get('code') is None or (st.session_state['access_token'] is None):
+    if st.session_state.get('code') is None or ('access_token' not in st.session_state or st.session_state['access_token'] is None):
         auth_params = {
             'client_id': CLIENT_ID,
             'response_type': 'code',