php - Codeigniter after update 3.1.1 to 3.1.2 error batch_update -

since run codeigniter 3.1.1 no problem several update haven't check slide change position id , error on codeigniter 3.1.2

$data = [     ['sl_id' =>  49, 'sl_move' => 1],     ['sl_id' => 48, 'sl_move' => 2] ];  // error update_batch line : undefined index: sl_id  if( ! $this->db->update_batch($this->table, $data, 'sl_id')) {     //false } else {     //true } 

sql syntax error show below:

error number: 1064  have error in sql syntax; check manual corresponds mysql server version right syntax use near 'then '49' when `sl_id` = '48' else `sl_id` end, `sl_move` = case when `sl' @ line 2  update `tbl_slide` set `sl_id` = case when `sl_id` = '49' when `sl_id` = '48' else `sl_id` end, `sl_move` = case when `sl_id` = '1' when `sl_id` = '2' else `sl_move` end `sl_id` in(,)  filename: c:/wamp/www/codeigniter_project/system/database/db_driver.php  line number: 691