I get a lot of these in my log today, having upgraded to 1.1.9 yesterday:

Oct 5, 2010 10:28:06 AM hudson.triggers.SCMTrigger$Runner runPolling
SEVERE: Failed to record SCM polling
java.lang.NullPointerException
at hudson.plugins.perforce.PerforceSCM.getEffectiveClientName(PerforceSCM.java:1071)
at hudson.plugins.perforce.PerforceSCM.getPerforceWorkspace(PerforceSCM.java:953)
at hudson.plugins.perforce.PerforceSCM.pollChanges(PerforceSCM.java:755)
at hudson.scm.SCM.poll(SCM.java:372)
at hudson.model.AbstractProject.poll(AbstractProject.java:1208)
at hudson.triggers.SCMTrigger$Runner.runPolling(SCMTrigger.java:417)
at hudson.triggers.SCMTrigger$Runner.run(SCMTrigger.java:446)
at hudson.util.SequentialExecutionQueue$QueueEntry.run(SequentialExecutionQueue.java:118)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

I haven't been able to determine which jobs it fails for, so I can't tell if it's only for remote clients. I do have many of those, though.