NullPointerException in o.a.m.shared.release.phase.AbstractBackupPomsPhase.getPomBackup

Got the following stack trace after an apparent successful deploy to a previously empty staging repository:

C:\...>mvn release:perform -DconnectionUrl=scm:svn:http://svn.apache.org/repos/asf/logging/log4j/tags/v1_2_15_rc2
...
...
...
1044/1047K
1047/1047K
1047K uploaded
[INFO] ---------------------------------------------------------------------
—
[INFO] BUILD SUCCESSFUL
[INFO] ---------------------------------------------------------------------
—
[INFO] Total time: 3 minutes 51 seconds
[INFO] Finished at: Wed May 16 17:18:02 CDT 2007
[INFO] Final Memory: 14M/29M
[INFO] ---------------------------------------------------------------------
—
[INFO] Cleaning up after release...
[INFO] ------------------------------------------------------------------------
[ERROR] FATAL ERROR
[INFO] ------------------------------------------------------------------------
[INFO] null
[INFO] ------------------------------------------------------------------------
[INFO] Trace
java.lang.NullPointerException
at org.apache.maven.shared.release.phase.AbstractBackupPomsPhase.getPomB
ackup(AbstractBackupPomsPhase.java:38)
at org.apache.maven.shared.release.phase.AbstractBackupPomsPhase.deleteP
omBackup(AbstractBackupPomsPhase.java:43)
at org.apache.maven.shared.release.phase.CreateBackupPomsPhase.clean(Cre
ateBackupPomsPhase.java:69)
at org.apache.maven.shared.release.DefaultReleaseManager.clean(DefaultRe
leaseManager.java:506)
at org.apache.maven.shared.release.DefaultReleaseManager.perform(Default
ReleaseManager.java:447)
at org.apache.maven.shared.release.DefaultReleaseManager.perform(Default
ReleaseManager.java:281)
at org.apache.maven.shared.release.DefaultReleaseManager.perform(Default
ReleaseManager.java:273)
at org.apache.maven.plugins.release.PerformReleaseMojo.execute(PerformRe
leaseMojo.java:96)
at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPlugi
nManager.java:443)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(Defa
ultLifecycleExecutor.java:539)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandalone
Goal(DefaultLifecycleExecutor.java:493)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(Defau
ltLifecycleExecutor.java:463)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHan
dleFailures(DefaultLifecycleExecutor.java:311)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegmen
ts(DefaultLifecycleExecutor.java:224)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLi
fecycleExecutor.java:143)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:334)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:125)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:272)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)

at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4 minutes 33 seconds
[INFO] Finished at: Wed May 16 17:18:02 CDT 2007
[INFO] Final Memory: 4M/9M
[INFO] ------------------------------------------------------------------------

C:\prep>