Problema nella dichiarazione di una funzione | SQL & MySQL

 delimiter ||
 
 DROP FUNCTION IF EXISTS strip_tags||
 CREATE FUNCTION strip_tags( x longtext) RETURNS longtext
 LANGUAGE SQL NOT DETERMINISTIC READS SQL DATA 
 BEGIN
 DECLARE sstart INT UNSIGNED;
 DECLARE ends INT UNSIGNED;
 SET sstart = LOCATE('<', x, 1);
REPEAT
SET ends = LOCATE('>', x, sstart);
SET x = CONCAT(SUBSTRING( x, 1 ,sstart -1) ,SUBSTRING(x, ends +1 )) ; 
SET sstart = LOCATE('<', x, 1);
UNTIL sstart < 1 END REPEAT;
return x;
END;
||
delimiter ;

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'delimiter ||

DROP FUNCTION IF EXISTS strip_tags||
CREATE FUNCTION strip_tags'

 CREATE FUNCTION strip_tags( x longtext) RETURNS longtext
 LANGUAGE SQL NOT DETERMINISTIC READS SQL DATA 
 BEGIN
 DECLARE sstart INT UNSIGNED;
 DECLARE ends INT UNSIGNED;
 SET sstart = LOCATE('<', x, 1);
 REPEAT
 SET ends = LOCATE('>', x, sstart);
 SET x = CONCAT(SUBSTRING( x, 1 ,sstart -1) ,SUBSTRING(x, ends +1 )) ; 
SET sstart = LOCATE('<', x, 1);
UNTIL sstart < 1 END REPEAT;
return x;
END;

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 4