MailingListCompiler trying to send email with empty "To"

2007-09-16 22:59:32,340 Sending mailitem com.atlassian.jira.mail.IssueMailQueueItem@1db1db7[issue=com.atlassian.jira.issue.IssueImpl@11ee18e[id=12531,summary=Java 
Developer - David Taylor,key=RCRT-227,created=2007-08-28 17:05:22.988,updated=2007-09-16 
22:58:14.501,assignee=snguyen,reporter=<null>],remoteUser=snguyen,notificationType=All_Watchers,eventTypeId=6,templateId=6] 
ERROR [atlassian.jira.mail.IssueMailQueueItem] 'To' is a required field
java.lang.IllegalArgumentException: 'To' is a required field
	at com.atlassian.mail.Email.<init>(Email.java:51)
	at com.atlassian.jira.mail.Email.<init>(Email.java:18)
	at com.atlassian.jira.mail.MailingListCompiler.createEmail(MailingListCompiler.java:297)
	at com.atlassian.jira.mail.MailingListCompiler.addMailsToQueue(MailingListCompiler.java:249)
	at com.atlassian.jira.mail.MailingListCompiler.access$200(MailingListCompiler.java:35)
	at com.atlassian.jira.mail.MailingListCompiler$NotificationCompiler.addEmailsToQueue(MailingListCompiler.java:423)
	at com.atlassian.jira.mail.MailingListCompiler$NotificationCompiler.sendLists(MailingListCompiler.java:391)
	at com.atlassian.jira.mail.MailingListCompiler$NotificationCompiler.sendForEvent(MailingListCompiler.java:345)
	at com.atlassian.jira.mail.MailingListCompiler.sendLists(MailingListCompiler.java:126)
	at com.atlassian.jira.mail.IssueMailQueueItem.send(IssueMailQueueItem.java:167)
	at com.atlassian.mail.queue.MailQueueImpl.sendBuffer(MailQueueImpl.java:68)
	at com.atlassian.jira.service.services.mail.MailQueueService.run(MailQueueService.java:23)
	at com.atlassian.jira.service.JiraServiceContainerImpl.run(JiraServiceContainerImpl.java:67)
	at com.atlassian.jira.service.ServiceRunner.execute(ServiceRunner.java:61)
	at org.quartz.core.JobRunShell.run(JobRunShell.java:191)
	at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:516)