Error in edit issue in GreenHopper v. 2.2 EAP

We are getting the following error on some issues when we try to edit them. Also note that nothing happens when I try to change the rank of an issue that is in this "state". We are trying to edit the issue with the default edit screen. The issue in this example has a ranking number.

2008-02-26 15:10:30,822 http-8090-Processor13 ERROR [web.action.issue.EditSubTaskIssue] Exception occurred editing issue: java.util.NoSuchElementException
java.util.NoSuchElementException
at java.util.TreeMap.key(TreeMap.java:1206)
at java.util.TreeMap.lastKey(TreeMap.java:274)
at com.pyxis.greenhopper.jira.customfields.RankingCFType.updatePosition(RankingCFType.java:258)
at com.pyxis.greenhopper.jira.customfields.RankingCFType.updateValue(RankingCFType.java:121)
at com.pyxis.greenhopper.jira.customfields.RankingCFType.setNewIssuePosition(RankingCFType.java:161)
at com.pyxis.greenhopper.jira.customfields.RankingCFType.updateValue(RankingCFType.java:107)
at com.atlassian.jira.issue.fields.CustomFieldImpl.updateValue(CustomFieldImpl.java:351)
at com.atlassian.jira.issue.fields.CustomFieldImpl.updateValue(CustomFieldImpl.java:312)
at com.atlassian.jira.action.issue.IssueUpdate.doExecute(IssueUpdate.java:59)
at webwork.action.ActionSupport.execute(ActionSupport.java:153)
at com.atlassian.jira.action.JiraActionSupport.execute(JiraActionSupport.java:54)
at com.atlassian.jira.action.JiraNonWebActionSupport.execute(JiraNonWebActionSupport.java:27)
at webwork.dispatcher.GenericDispatcher.executeAction(GenericDispatcher.java:132)
at com.atlassian.core.action.DefaultActionDispatcher.execute(DefaultActionDispatcher.java:36)
at com.atlassian.jira.web.action.issue.EditIssue.doExecute(EditIssue.java:197)
at webwork.action.ActionSupport.execute(ActionSupport.java:153)
at com.atlassian.jira.action.JiraActionSupport.execute(JiraActionSupport.java:54)
at webwork.dispatcher.GenericDispatcher.executeAction(GenericDispatcher.java:132)
at com.atlassian.jira.web.dispatcher.JiraServletDispatcher.service(JiraServletDispatcher.java:211)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)