Update app.py

app.py

@@ -155,7 +155,7 @@ if st.session_state.image is not None:
                     st.session_state.image_counter -= 1
         with row4b_col3:
             if st.button("Next"):
-                if st.session_state.image_counter < len(results):
+                if st.session_state.image_counter < len(st.sessionstate.results):
                     st.session_state.image_counter += 1
                 
         # Plot predicted image