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java.lang.NullPointerException: 	at com.atlassian.jira.security.roles.actor.UserRoleActorFactory$UserRoleActor.contains(UserRoleActorFactory.java:114)	at com.atlassian.jira.security.roles.CachingProjectRoleAndActorStore$CachedDefaultRoleActors.contains(CachingProjectRoleAndActorStore.java:465)	at com.atlassian.jira.security.roles.DefaultProjectRoleManager.getProjectRoles(DefaultProjectRoleManager.java:37)	at com.atlassian.jira.issue.fields.CommentSystemField.getRoleLevels(CommentSystemField.java:515)	at com.atlassian.jira.issue.fields.CommentSystemField.populateVelocityParams(CommentSystemField.java:407)	at com.atlassian.jira.issue.fields.CommentSystemField.getCreateHtml(CommentSystemField.java:108)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)