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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)