MySQL 9.1 Release Notes
If you get Commands out of sync; you can't run this
command now in your client code, you are calling
client functions in the wrong order.
This can happen, for example, if you are using
mysql_use_result() and try to
execute a new query before you have called
mysql_free_result(). It can
also happen if you try to execute two queries that return data
without calling
mysql_use_result() or
mysql_store_result() in
between.