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

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This exception has no message.
java.lang.NullPointerException:
at org.codehaus.staxmate.out.SMOutputContext.writeCharacters(SMOutputContext.java:479)
at com.atlassian.bamboo.migration.SMOutputElementAppender.append(SMOutputElementAppender.java:39)
at com.atlassian.bamboo.deployments.versions.migration.stream.DeploymentVersionPropertiesMapper.exportProperties(DeploymentVersionPropertiesMapper.java:64)
at com.atlassian.bamboo.deployments.versions.migration.stream.DeploymentVersionPropertiesMapper.exportProperties(DeploymentVersionPropertiesMapper.java:23)
at com.atlassian.bamboo.migration.BambooStAXMappingHelperAbstractImpl.exportXml(BambooStAXMappingHelperAbstractImpl.java:107)
at com.atlassian.bamboo.deployments.versions.migration.stream.DeploymentVersionMapper.exportProperties(DeploymentVersionMapper.java:95)
at com.atlassian.bamboo.deployments.versions.migration.stream.DeploymentVersionMapper.exportProperties(DeploymentVersionMapper.java:36)
at com.atlassian.bamboo.migration.BambooStAXMappingHelperAbstractImpl.exportXml(BambooStAXMappingHelperAbstractImpl.java:107)
at com.atlassian.bamboo.migration.BambooStAXMappingListHelperAbstractImpl.exportListXml(BambooStAXMappingListHelperAbstractImpl.java:167)
at com.atlassian.bamboo.deployments.projects.migration.stream.DeploymentProjectMapper.exportProperties(DeploymentProjectMapper.java:139)
at com.atlassian.bamboo.deployments.projects.migration.stream.DeploymentProjectMapper.exportProperties(DeploymentProjectMapper.java:34)
at com.atlassian.bamboo.migration.BambooStAXMappingHelperAbstractImpl.exportXml(BambooStAXMappingHelperAbstractImpl.java:107)
at com.atlassian.bamboo.migration.BambooStAXMappingListHelperAbstractImpl.exportListXml(BambooStAXMappingListHelperAbstractImpl.java:167)
at com.atlassian.bamboo.migration.BambooStAXMappingListHelperAbstractImpl.exportListXml(BambooStAXMappingListHelperAbstractImpl.java:146)
at com.atlassian.bamboo.deployments.projects.migration.stream.DeploymentProjectMapper.exportData(DeploymentProjectMapper.java:89)
at com.atlassian.bamboo.migration.XmlMigrator.exportToStream(XmlMigrator.java:499)

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