Update app.py

app.py

@@ -131,7 +131,7 @@ if (summ_text is not None) or ('summ_text' in st.session_state):
     with col2:
         st.markdown(
             f'<div style="display: flex; justify-content: center; align-items: center; height: 100%;">'
-            f'Page {st.session_state.page_index + 1} of {len(summ_text)}'
+            f'Page {st.session_state.page_index + 1} of {len(st.session_state.summ_text)}'
             f'</div>',
             unsafe_allow_html=True
         )