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

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This exception has no message.
java.lang.NullPointerException:
at com.atlassian.crowd.embedded.impl.IdentifierUtils.toLowerCase(IdentifierUtils.java:42)
at com.atlassian.jira.user.ApplicationUserEntity.(ApplicationUserEntity.java:18)
at com.atlassian.jira.upgrade.tasks.UpgradeTask_Build6040.mapUsername(UpgradeTask_Build6040.java:72)
at com.atlassian.jira.upgrade.tasks.UpgradeTask_Build6040.doUpgrade(UpgradeTask_Build6040.java:63)
at com.atlassian.jira.upgrade.UpgradeManagerImpl.doUpgradeTaskSuccess(UpgradeManagerImpl.java:673)
at com.atlassian.jira.upgrade.UpgradeManagerImpl.runUpgradeTasks(UpgradeManagerImpl.java:526)
at com.atlassian.jira.upgrade.UpgradeManagerImpl.doUpgrade(UpgradeManagerImpl.java:456)
at com.atlassian.jira.upgrade.UpgradeManagerImpl.doUpgradeIfNeeded(UpgradeManagerImpl.java:399)
at com.atlassian.jira.upgrade.UpgradeManagerImpl.doUpgradeIfNeededAndAllowed(UpgradeManagerImpl.java:333)
at com.atlassian.jira.upgrade.UpgradeLauncher.checkIfUpgradeNeeded(UpgradeLauncher.java:100)
at com.atlassian.jira.upgrade.UpgradeLauncher.start(UpgradeLauncher.java:49)
at com.atlassian.jira.startup.DefaultJiraLauncher$3.run(DefaultJiraLauncher.java:117)
at com.atlassian.jira.config.database.DatabaseConfigurationManagerImpl.doNowOrEnqueue(DatabaseConfigurationManagerImpl.java:315)
at com.atlassian.jira.config.database.DatabaseConfigurationManagerImpl.doNowOrWhenDatabaseActivated(DatabaseConfigurationManagerImpl.java:209)
at com.atlassian.jira.startup.DefaultJiraLauncher.postDbLaunch(DefaultJiraLauncher.java:105)
at com.atlassian.jira.startup.DefaultJiraLauncher.access$100(DefaultJiraLauncher.java:30)
at com.atlassian.jira.startup.DefaultJiraLauncher$1.run(DefaultJiraLauncher.java:69)
at com.atlassian.jira.util.devspeed.JiraDevSpeedTimer.run(JiraDevSpeedTimer.java:33)
at com.atlassian.jira.startup.DefaultJiraLauncher.start(DefaultJiraLauncher.java:64)
at com.atlassian.jira.startup.LauncherContextListener.contextInitialized(LauncherContextListener.java:54)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4791)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5285)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

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