java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.atlassian.bamboo.user.DefaultAuthenticationContext.getUserName(DefaultAuthenticationContext.java:55)
at com.atlassian.bamboo.persister.DefaultAuditLogService.log(DefaultAuditLogService.java:181)
at com.atlassian.bamboo.persister.xstream.XStreamAdminConfigPersister.logChanges(XStreamAdminConfigPersister.java:117)
at com.atlassian.bamboo.persister.xstream.XStreamAdminConfigPersister.saveConfiguration(XStreamAdminConfigPersister.java:83)
at com.atlassian.bamboo.persister.file.FileBasedPersister.saveAdministrationConfiguration(FileBasedPersister.java:251)
at com.atlassian.bamboo.configuration.DefaultAdministrationConfigurationManager.saveAdministrationConfiguration(DefaultAdministrationConfigurationManager.java:26)
at com.atlassian.bamboo.security.trustedapplications.BambooTrustedApplicationsManager.getCurrentApplication(BambooTrustedApplicationsManager.java:64)
at com.atlassian.security.auth.trustedapps.filter.TrustedApplicationsFilter$CertificateServerImpl.writeCertificate(TrustedApplicationsFilter.java:200)
at com.atlassian.security.auth.trustedapps.filter.TrustedApplicationsFilter.doFilter(TrustedApplicationsFilter.java:90)

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