i am getting error while taking backup of confluence space

[Chandrabhushan Kumar]

i am trying to take back up of my current space from confluence but getting error.

java.util.concurrent.ExecutionException: java.lang.NullPointerException

java.util.concurrent.ExecutionException: java.lang.NullPointerException: Cannot invoke "com.atlassian.sal.api.user.UserKey.getStringValue()" because "userKey" is null

[Shawn Doyle - ReleaseTEAM]

See if the workaround in this post helps.

https://community.atlassian.com/t5/Confluence-questions/Confluence-cannot-make-a-backup/qaq-p/2540248