[Freeswitch-users] nibblebill custom_sql_save

Hello guys, I have the following config for nibbebill: <param name="custom_sql_lookup" value="SELECT ${card_db_column_cash} AS nibble_balance FROM ${card_db_table} WHERE ${card_db_column_account}=${nibble_account};" /> <param name="custom_sql_save" value="UPDATE ${card_db_table} SET ${card_db_column_cash}=${card_db_column_cash}-${nibble_increment} WHERE ${card_db_column_account}=${nibble_account};" /> I see this on the log, which is obviously failing: [UPDATE cards_table SET balance=balance- WHERE pin=12345;] is ${nibble_increment} not the correct variable to use? It looks like it is empty! Thanks! David