Jira 4.3 returning Java.Lang.NullPointerException

[pankaj hooda]

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.

[Nic Brough -Adaptavist-]

You've got a broken validator or field.  I'd lean towards it being a field, but don't want to rule out a validator without more information.

Could you check the validators on the workflow transition you're trying to run - are there any?  If there are, what are they?

If you don't have validators, then you need to look at the fields.  From the name, it looks like you have some add-on that provides an extra field type which you'll need to identify.  I'd try disabling the add-on providing any non-JIRA custom fields (look for ones that relate to work logs) and try it again.  If that fixes it, at least you know it's something to do with the fields.