not reading it or testing fully (sorry but im at work) but going off the error message it seems somewhere your script is inserting '; before the UPDATE statement, check the string inputted into the function.

if this isnt the case, i will have a look later if no1 else answers before me :)

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mysql> SELECT * FROM `users` WHERE `users`.`clue` > 0;
Empty set (0.00 sec)