What is wrong with my Stored Procedure?

[Scott Rich]

delimiter $$

DROP PROCEDURE IF EXISTS spChangeSystemTemplateFieldOrder$$

CREATE DEFINER=`root`@`localhost` PROCEDURE `spChangeSystemTemplateFieldOrder`(IN idTemplateFieldSelected INT,
IN iOrderSelected INT, IN idTemplateFieldReplace INT, IN iOrderReplace INT, OUT sp_result TINYINT)

BEGIN
DECLARE EXIT HANDLER FOR SQLEXCEPTION ROLLBACK;
DECLARE EXIT HANDLER FOR SQLWARNING ROLLBACK;

START TRANSACTION;

SET sp_result = 0;

/* Modify selected row order */
Update SystemTemplateFields
SET UDF_Order = iOrderSelected
WHERE idTemplateField = idTemplateFieldSelected;

/* Modify replaced row order */
Update SystemTemplateFields
SET UDF_Order = iOrderReplace
WHERE idTemplateField = idTemplateFieldReplace;

SET sp_result = 1;

COMMIT;


END$$

DELIMITER ;

When I call this procedure (CALL spChangeSystemTemplateFieldOrder(24,1,23,2,@a);) from the CLI, I get the following error:

ERROR 1436 (HY000): Thread stack overrun: 8992 bytes used of a 131072 byte stack, and 128000 bytes needed. Use 'mysqld --thread_stack=#' to specify a bigger stack.

Any ideas?