I have done the resolution and still have the same issue

This question is in reference to Atlassian Documentation: User directory synchronization fails with NullPointerException at HibernateConfluenceUserDao.rename

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What, exactly, does the log say now?  What is the output from the SQL query?

The query returned zero records. The log returnes the same error 

Ok, this needs to go to Atlassian support really - you've done everything right and it's a bug in their stuff.

This is exactly what I've done. Thank you

The resolution says to run the sql query 

SELECT * FROM user_mapping WHERE LOWER(username) != lower_username OR lower_username IS NULL;

and Fix the mismatch accordingly, and the issue should be resolved.  What does this mean? How do you fix the mismatch? The entries cannot just be deleted as there are other tables referencing it.

Have you followed the rest of the instructions?

You need to update the lines the SQL finds and make them the same.

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