I have set-up a build with the git plugin - it uses polling, but it always fails with the following error seen in "Git Polling Log":

Git Polling Log

Started on Feb 10, 2013 12:06:00 PM
Using strategy: Default
[poll] Last Build : #2
Fetching changes from the remote Git repositories
Fetching upstream changes from git://devel.brailcom.org/git/lcg.git
Polling for changes in
Seen branch in repository origin/HEAD
Seen branch in repository origin/eurochance
Seen branch in repository origin/master
Seen branch in repository origin/parse-inline-markup
ERROR: Failed to record SCM polling for hudson.model.FreeStyleProject@6099210f[LCG]
java.lang.RuntimeException: No author in changeset null
at hudson.plugins.git.GitChangeSet.getAuthorName(GitChangeSet.java:324)
at hudson.plugins.git.GitSCM.isRevExcluded(GitSCM.java:1788)
at hudson.plugins.git.GitSCM.access$300(GitSCM.java:72)
at hudson.plugins.git.GitSCM$1.invoke(GitSCM.java:755)
at hudson.plugins.git.GitSCM$1.invoke(GitSCM.java:731)
at hudson.FilePath.act(FilePath.java:865)
at hudson.FilePath.act(FilePath.java:838)
at hudson.plugins.git.GitSCM.compareRemoteRevisionWithImpl(GitSCM.java:731)
at hudson.plugins.git.GitSCM.compareRemoteRevisionWith(GitSCM.java:644)
at hudson.scm.SCM._compareRemoteRevisionWith(SCM.java:356)
at hudson.scm.SCM.poll(SCM.java:373)
at hudson.model.AbstractProject._poll(AbstractProject.java:1480)
at hudson.model.AbstractProject.poll(AbstractProject.java:1410)
at hudson.triggers.SCMTrigger$Runner.runPolling(SCMTrigger.java:439)
at hudson.triggers.SCMTrigger$Runner.run(SCMTrigger.java:468)
at hudson.util.SequentialExecutionQueue$QueueEntry.run(SequentialExecutionQueue.java:118)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:636)