NullPointerException in JobInProgress.getTaskInProgress

Saw this in the JobTracker log when a user was trying to reload a page for a running job that since finished.

2007-03-09 00:23:44,029 WARN /: /taskdetails.jsp?jobid=job_0003&taskid=tip_0003_m_001379:
java.lang.NullPointerException
at org.apache.hadoop.mapred.JobInProgress.getTaskInProgress(JobInProgress.java:916)
at org.apache.hadoop.mapred.JobTracker.getTip(JobTracker.java:1551)
at org.apache.hadoop.mapred.JobTracker.getTaskStatuses(JobTracker.java:1526)
at org.apache.hadoop.mapred.taskdetails_jsp._jspService(taskdetails_jsp.java:59)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:427)
at org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:475)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:567)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1565)
at org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:635)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1517)
at org.mortbay.http.HttpServer.service(HttpServer.java:954)
at org.mortbay.http.HttpConnection.service(HttpConnection.java:814)
at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:981)
at org.mortbay.http.HttpConnection.handle(HttpConnection.java:831)
at org.mortbay.http.SocketListener.handleConnection(SocketListener.java:244)
at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357)
at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)