Error occurs as Migrate/Create new MySQL database instance in BitBucket Edited

To Migrate MySQL on Bitbucket I have followed the below instruction and ended up with an error.

Step 01: Install J driver in Bitbucket
download latest driver “mysql-connector-java-5.1.44” to the Bitbucket folder, 
"C:\Atlassian\Bitbucket\5.3.1\app\WEB-INF\lib"

Step 02: Install MySQL and create database with privilege 
CREATE DATABASE bitbucket CHARACTER SET utf8 COLLATE utf8_bin;
GRANT ALL PRIVILEGES ON bitbucket.* TO 'root'@'172.20.20.25' IDENTIFIED BY 'xxx';

Step 03: Migrate MySQL from Bitbucket I) Login to the Bitbucket and select migrate database. II) Click on Migrate database.

III) Once required fields are filled out, click on Test button to test the connection. IV) Clicking on Start Migration ends up with a MySQL error.

The schema could not be created.

You can't specify target table 'cwd_user' for update in FROM clause [Failed SQL: UPDATE bitbucket.cwd_user SET external_id = NULL WHERE id IN (SELECT a.id FROM ( SELECT b.id FROM cwd_user b JOIN (SELECT c.directory_id, c.external_id FROM cwd_user c GROUP BY c.directory_id, c.external_id HAVING COUNT(*) > 1 ) sq on b.directory_id = sq.directory_id AND b.external_id = sq.external_id ) a )]

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