Stored Procedure Crashes Server

CREATE TABLE `TEST` (

  `objectid` int(11) NOT NULL,

  `submissionid` int(11) DEFAULT NULL,

  `objectname` varchar(255) DEFAULT NULL,

  `objecturl` varchar(1000) DEFAULT NULL,

  `reviewercomment` varchar(1000) DEFAULT NULL,

  `isactive` tinyint(1) DEFAULT NULL,

  `createdon` datetime DEFAULT NULL,

  `createdby` varchar(255) DEFAULT NULL,

  `updatedon` datetime DEFAULT NULL,

  `updatedby` varchar(255) DEFAULT NULL

) ENGINE=InnoDB DEFAULT CHARSET=utf8;

MariaDB [mytest]> DELIMITER $$

MariaDB [mytest]> CREATE OR REPLACE PROCEDURE `testsp_doesnot_works`()

     BEGIN

     SET SESSION group_concat_max_len = 100000000000;

     SELECT JSON_EXTRACT(

       IFNULL(

         (

           SELECT CONCAT(

             '[',

             GROUP_CONCAT(

               JSON_OBJECT(

                 'objectId', objectId,

                 'objectName', objectName,'objectUrl', objectUrl,'reviewerComment', reviewerComment,'createdOn', DATE_FORMAT(createdOn,"%Y-%m-%dT%H:%i:%sZ")

               )

             ),

             ']'

           )     

         ),

         '[]'

       ),

       '$'

     ) AS comments

     FROM(select objectId, objectName, objectUrl, reviewerComment, createdOn FROM `TEST`) AS body;

     END$$

Query OK, 0 rows affected (0.004 sec)

MariaDB [mytest]> DELIMITER ;

 FROM(select objectId, objectName, objectUrl, reviewerComment, createdOn FROM `TEST`) AS body;

with 

{code:sql}

   FROM(select objectId, objectName, objectUrl, reviewerComment, createdOn FROM `TEST` LIMIT 50 ) AS body;