if 'LOB_edited_df' not in st.session_state:
LOBMapping = st.session_state.LOBMapping
LOBMapping.fillna("",inplace=True)
st.session_state.LOB_edited_df = st.data_editor(LOBMapping)
else:
st.session_state.LOB_edited_df = st.data_editor(st.session_state.LOB_edited_df)