When using option to integrate to upstream after a successful build build of project failed with this error :

[JENKINS] Archiving C:\Users\joffroy\.jenkins\workspace\ProjetSpringWTP01-ProjetSpringWTP01_branche1\ProjetSpringWTP01_branche1\target\ProjetSpringWTP01.war to C:\Users\joffroy\.jenkins\jobs\ProjetSpringWTP01-ProjetSpringWTP01_branche1\modules\fr.offroy$ProjetSpringWTP01\builds\2011-09-04_22-28-44\archive\fr.offroy\ProjetSpringWTP01\1.0.1-SNAPSHOT\ProjetSpringWTP01-1.0.1-SNAPSHOT.war
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESSFUL
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4 seconds
[INFO] Finished at: Sun Sep 04 22:28:51 CEST 2011
[INFO] Final Memory: 17M/41M
[INFO] ------------------------------------------------------------------------
channel stopped
ERROR: Publisher jenkins.plugins.svnmerge.IntegrationPublisher aborted due to exception
java.lang.NullPointerException
at jenkins.plugins.svnmerge.IntegrateAction.perform(IntegrateAction.java:131)
at jenkins.plugins.svnmerge.IntegrateAction.perform(IntegrateAction.java:120)
at jenkins.plugins.svnmerge.IntegrationPublisher.perform(IntegrationPublisher.java:47)
at hudson.tasks.BuildStepMonitor$2.perform(BuildStepMonitor.java:27)
at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:682)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:657)
at hudson.maven.MavenModuleSetBuild$RunnerImpl.post2(MavenModuleSetBuild.java:958)
at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:604)
at hudson.model.Run.run(Run.java:1401)
at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:479)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:230)
Sending e-mails to: jerome.offroy@gmail.com
Finished: FAILURE