but how to manage possibility user has not the attribute? on my installation 6.4.2 occure error: 2018-05-29 08:59:51,583 ERROR ErrorPageHandlerAction,http-nio-8080-exec-5:118 - Error UID ee1e6984-fd7f-44c9-866c-a566c3846a17 com.jaspersoft.jasperserver.api.SessionAttribMissingException: cluster.exception.session.attribute.missing Arguments: