[CmZxC]

Код:

[01:52:15] [DEBUG] mysql_format - connection: 1, len: 400, format: "UPDATE `houses` SET `HOwnerID`= '%d',
 SET `HOwned` = 1 WHERE `hID` = '%d'"

You have a second "SET" in your format.
"UPDATE `houses` SET `HOwnerID`= '%d', SET `HOwned` = 1 WHERE `hID` = '%d'"

Remove the second SET, keep everything else.