java.lang.NullPointerException
at com.atlassian.jira.issue.customfields.impl.ExtendedWorklogCFType.validateFromParams(ExtendedWorklogCFType.java:132)
at com.atlassian.jira.issue.fields.CustomFieldImpl.validateParams(CustomFieldImpl.java:702)
at com.atlassian.jira.bc.issue.DefaultIssueService.validateAndPopulateParams(DefaultIssueService.java:749)
at com.atlassian.jira.bc.issue.DefaultIssueService.validateAndUpdateIssueFromFields(DefaultIssueService.java:562)
at com.atlassian.jira.bc.issue.DefaultIssueService.validateTransition(DefaultIssueService.java:461)
at com.atlassian.jira.bc.issue.DefaultIssueService.validateTransition(DefaultIssueService.java:482)
at com.atlassian.jira.web.action.issue.CommentAssignIssue.doValidation(CommentAssignIssue.java:181)
at webwork.action.ActionSupport.validate(ActionSupport.java:391)
at webwork.action.ActionSupport.execute(ActionSupport.java:162)...........
This issue is coming when i try to resolve/close any issue in JIRA.Please suggest.