Ошибка в процедуре с курсором

DELIMITER $$
CREATE PROCEDURE friends_get(accessToken VARCHAR(32), OUT res mediumtext) 
MODIFIES SQL DATA
    BEGIN
        DECLARE idu INT DEFAULT 0;
        
        DECLARE COUNT INT DEFAULT 0;
 
        DECLARE DATE TIMESTAMP;
        DECLARE dist INT;
        DECLARE name VARCHAR(32);
        DECLARE img BOOLEAN;
        DECLARE id_friend INT;
        DECLARE id_list INT;
        
        DECLARE done INT DEFAULT FALSE;
        DECLARE req cursor FOR
            SELECT friends.id_friend, friends.id_list, account.name, account.img, getDist(coord.shir, coord.dolg, @shir1, @dolg1) AS dist, coord.date
                FROM (SELECT id_friend, id_list FROM friends WHERE _id = 2 AND id_friend IN(SELECT _id FROM friends WHERE id_friend = 2)) AS friends
                LEFT OUTER JOIN account
                ON friends.id_friend = account._id
                LEFT OUTER JOIN coord
                ON friends.id_friend = coord._id;
                -- order by friends.id_list asc, account.name asc;
         DECLARE continue handler FOR NOT found SET done = TRUE;
        
         SET idu = getIdByKey(accessToken);
         IF idu IS NULL
            THEN SET res = "{\"resCode\":10}";
        ELSE
            SELECT shir, dolg INTO @shir1, @dolg1 FROM coord WHERE _id = idu LIMIT 1;
            SET res = "{\"resCode\":1, \"users\":[";
            OPEN req;
            read_loop: loop
                fetch req INTO id_friend, id_list, name, img, dist, DATE;
                IF done THEN
                    leave read_loop;
                END IF;
                SET res = concat(res, "rgef");
                SET res = concat(res, "{"
                                "\"id_friend\":", COALESCE(id_friend, ""),
                                ",\"id_list\":", COALESCE(id_list, ""),
                                ",\"name\":\"", COALESCE(name, ""), "\"",
                                ",\"img\":\"", COALESCE(img, 0), "\"",
                                ",\"dist\":", COALESCE(dist, 0),
                                ",\"date\":\"", COALESCE(UNIX_TIMESTAMP() - UNIX_TIMESTAMP(DATE), ""), "\"",
                                "},");
                SET COUNT = COUNT + 1;
            END loop;
            close req;
            
            IF COUNT > 0 THEN SET res = SUBSTRING(res,1,CHAR_LENGTH(res)-1); END IF;
            SET res = concat(res, "]}");
        END IF;
    END;
$$
DELIMITER ;

SELECT friends.id_friend, friends.id_list, account.name, account.img, getDist(coord.shir, coord.dolg, 0.0, 0.0) AS dist, coord.date
                FROM (SELECT id_friend, id_list FROM friends WHERE _id = 2 AND id_friend IN(SELECT _id FROM friends WHERE id_friend = 2)) AS friends
                LEFT OUTER JOIN account
                ON friends.id_friend = account._id
                LEFT OUTER JOIN coord
                ON friends.id_friend = coord._id
                ORDER BY friends.id_list ASC, account.name ASC;