Update app.py

app.py

@@ -61,7 +61,7 @@ with st.sidebar:
     # prevent user from clicking 'Find domains' button if email or sequence is empty
     domains_submitted = False  
     if st.button('Find domains'):
-        if email in st.session_state and sequence in st.session_state:
+        if 'email' in st.session_state and 'sequence' in st.session_state:
             domains_submitted = True
             st.session_state.disabled = True
         else: