Space Operations/Overview link throws error when Space Admins are not found

Steps to replicate (Global look and feel)

1. Click Space Tools > Overview.
2. The error below is displayed.

Steps to replicate (Documentation Theme)

1. Click Browse > Space Operations.
2. The error below is displayed.

Error

System Error
Cause
org.apache.velocity.exception.MethodInvocationException: Invocation of method 'getSpaceAdmins' in class com.atlassian.confluence.spaces.actions.ViewSpaceSummaryAction threw exception java.lang.NullPointerException at spaces/viewspacedetails.vm[line 36, column 53]
    at org.apache.velocity.runtime.parser.node.ASTIdentifier.execute(ASTIdentifier.java:223)
caused by: java.lang.NullPointerException
    at com.atlassian.confluence.spaces.DefaultSpaceManager$UserComparator.compare(DefaultSpaceManager.java:688)

Workaround

The error is caused by a group or individual user not being found in the space permissions page, possibly after having imported the space into the instance, or deleted a group/user. To workaround that, go to the space's permissions page and remove any 'not found' group or user.

• https://<your_domain>.atlassian.net/wiki/spaces/spacepermissions.action?key=<space_key>