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

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java.lang.NullPointerException:
at com.atlassian.bamboo.setup.ResetBrokerUrlUpgradeTask.doUpgrade(ResetBrokerUrlUpgradeTask.java:31)
at com.atlassian.bamboo.upgrade.UpgradeManagerAbstract.runUpgradeTask(UpgradeManagerAbstract.java:162)
at com.atlassian.bamboo.upgrade.BootstrapUpgradeManagerImpl.doUpgrade(BootstrapUpgradeManagerImpl.java:51)
at com.atlassian.bamboo.setup.DefaultBootstrapManager.performPersistenceUpgrade(DefaultBootstrapManager.java:201)

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