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java.lang.NullPointerException: 	at java.util.AbstractCollection.addAll(AbstractCollection.java:303)	at com.pyxis.greenhopper.jira.customfields.ReleasedVersionHistoryCFType.updateValue(ReleasedVersionHistoryCFType.java:68)	at com.pyxis.greenhopper.jira.customfields.ReleasedVersionHistoryCFType.updateValue(ReleasedVersionHistoryCFType.java:25)	at com.atlassian.jira.issue.fields.CustomFieldImpl.updateValue(CustomFieldImpl.java:411)	at com.atlassian.jira.issue.fields.CustomFieldImpl.updateValue(CustomFieldImpl.java:372)	at com.atlassian.jira.workflow.function.issue.GenerateChangeHistoryFunction.execute(GenerateChangeHistoryFunction.java:63)	at com.opensymphony.workflow.AbstractWorkflow.executeFunction(AbstractWorkflow.java:869)	at com.opensymphony.workflow.AbstractWorkflow.transitionWorkflow(AbstractWorkflow.java:1265)