Update app.py

app.py

@@ -105,7 +105,7 @@ if (summ_text is not None) or ('summ_text' in st.session_state):
     
     # Function to handle page turn
     def turn_page(direction):
-        if direction == "next" and st.session_state.page_index < len(summ_text) - 1:
+        if direction == "next" and st.session_state.page_index < len(st.session_state.summ_text) - 1:
             st.session_state.page_index += 1
         elif direction == "prev" and st.session_state.page_index > 0:
             st.session_state.page_index -= 1