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com.atlassian.util.concurrent.LazyReference$InitializationException: java.lang.NullPointerException	at com.atlassian.util.concurrent.LazyReference.getInterruptibly(LazyReference.java:149)	at com.atlassian.util.concurrent.LazyReference.get(LazyReference.java:112)	at com.atlassian.util.concurrent.ResettableLazyReference.get(ResettableLazyReference.java:87)	at com.atlassian.jira.issue.fields.CustomFieldImpl.getCustomFieldSearcher(CustomFieldImpl.java:1805)	at com.atlassian.jira.issue.fields.CustomFieldImpl.(CustomFieldImpl.java:247)	at com.atlassian.jira.issue.fields.CustomFieldImpl.(CustomFieldImpl.java:222)	at com.atlassian.jira.issue.managers.DefaultCustomFieldManager$CustomFieldCache.cloneCustomFields(DefaultCustomFieldManager.java:730)	at com.atlassian.jira.issue.managers.DefaultCustomFieldManager$CustomFieldCache.getAllCustomFields(DefaultCustomFieldManager.java:717)	at com.atlassian.jira.issue.managers.DefaultCustomFieldManager$CopyOnWriteCustomFieldCache.getAllCustomFields(DefaultCustomFieldManager.java:621)	at com.atlassian.jira.issue.managers.DefaultCustomFieldManager.getAllCustomFields(DefaultCustomFieldManager.java:417)	at com.atlassian.jira.issue.managers.DefaultCustomFieldManager.getCustomFieldObjects(DefaultCustomFieldManager.java:412)	at com.atlassian.jira.upgrade.tasks.UpgradeTask_Build6045.getCustomFields(UpgradeTask_Build6045.java:132)	at com.atlassian.jira.upgrade.tasks.UpgradeTask_Build6045.doUpgrade(UpgradeTask_Build6045.java:59)	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)