NPE while using linked copy feature

Simple scenario : a site has two languages, english and french for instance (order is important).
Validate a page in french (the second language) only, and then add a new page using the content picker engine, searching for the validated page title.
You get an ugly NPE like this one:

2009-05-12 17:57:08,265: INFO [BackgroundJob] - execute Background job BackgroundJob-2df713ef-8c46-4a69-8125-0f7200c8f7d1
started @ Tue May 12 17:57:08 CEST 2009
2009-05-12 17:57:08,265: INFO [ImportHandler] - Import starts (en)
2009-05-12 17:57:08,281: ERROR [ImportExportBaseService] - Error during copying
java.lang.NullPointerException
at org.jahia.services.importexport.JahiaLegacyExporter.export(JahiaLegacyExporter.java:440)
at org.jahia.services.importexport.JahiaLegacyExporter.export(JahiaLegacyExporter.java:135)
at org.jahia.services.importexport.ImportExportBaseService.export(ImportExportBaseService.java:712)
at org.jahia.services.importexport.ImportExportBaseService.copy(ImportExportBaseService.java:1528)
at org.jahia.services.importexport.ImportExportBaseService.copy(ImportExportBaseService.java:1478)
at org.jahia.services.importexport.ImportExportBaseService$$FastClassByCGLIB$$de1c40f7.invoke(<generated>)
at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:700)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
at org.springframework.aop.interceptor.AbstractTraceInterceptor.invoke(AbstractTraceInterceptor.java:113)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:635)
at org.jahia.services.importexport.ImportExportBaseService$$EnhancerByCGLIB$$ba485c5c.copy(<generated>)
at org.jahia.services.importexport.CopyJob.executeJahiaJob(CopyJob.java:81)
at org.jahia.services.scheduler.BackgroundJob.execute(BackgroundJob.java:150)
at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:525)