Error uploading site - String index out of range: 0

$ mvn -e site:deploy
+ Error stacktraces are turned on.
Apache Maven 2.2.1 (r801777; 2009-08-06 21:16:01+0200)
Java version: 1.5.0_22
Java home: C:\apps\dev\java\sun_jdk1.5.0_22\jre
Default locale: de_DE, platform encoding: Cp1252
OS name: "windows 7" version: "6.1" arch: "x86" Family: "windows"
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Building PL01
[INFO]    task-segment: [site:deploy]
[INFO] ------------------------------------------------------------------------
[INFO] [site:deploy {execution: default-cli}]
sftp://mv002.local/projects/pl01/htdocs/site/ - Session: Opened
[INFO] Pushing D:\workspaces\eclipse38\pl01\target\site
[INFO]    >>> to sftp://mv002.local/projects/pl01/htdocs/site/./
Recursively uploading directory D:\workspaces\eclipse38\pl01\target\site as ./
sftp://mv002.local/projects/pl01/htdocs/site/ - Session: Disconnecting
sftp://mv002.local/projects/pl01/htdocs/site/ - Session: Disconnected
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Error uploading site

Embedded error: Error occurred while deploying 'D:\workspaces\eclipse38\pl01\target\site' to remote repository: sftp://mv002.local/projects/pl01/site/
String index out of range: 0
[INFO] ------------------------------------------------------------------------
[INFO] Trace
org.apache.maven.lifecycle.LifecycleExecutionException: Error uploading site
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:719)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:569)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:539)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:387)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:348)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:362)
        at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:592)
        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)
Caused by: org.apache.maven.plugin.MojoExecutionException: Error uploading site
        at org.apache.maven.plugins.site.AbstractDeployMojo.push(AbstractDeployMojo.java:451)
        at org.apache.maven.plugins.site.AbstractDeployMojo.deploy(AbstractDeployMojo.java:286)
        at org.apache.maven.plugins.site.AbstractDeployMojo.deployTo(AbstractDeployMojo.java:247)
        at org.apache.maven.plugins.site.AbstractDeployMojo.execute(AbstractDeployMojo.java:164)
        at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694)
        ... 17 more
Caused by: org.apache.maven.wagon.TransferFailedException: Error occurred while deploying 'D:\workspaces\eclipse38\pl01\target\site' to remote re
pository: sftp://mv002.local/projects/pl01/htdocs/site/
        at org.apache.maven.wagon.providers.ssh.jsch.SftpWagon.putDirectory(SftpWagon.java:286)
        at org.apache.maven.plugins.site.AbstractDeployMojo.push(AbstractDeployMojo.java:434)
        ... 22 more
Caused by: 4:
        at com.jcraft.jsch.ChannelSftp.mkdir(ChannelSftp.java:1706)
        at org.apache.maven.wagon.providers.ssh.jsch.SftpWagon.mkdir(SftpWagon.java:204)
        at org.apache.maven.wagon.providers.ssh.jsch.SftpWagon.ftpRecursivePut(SftpWagon.java:300)
        at org.apache.maven.wagon.providers.ssh.jsch.SftpWagon.putDirectory(SftpWagon.java:277)
        ... 23 more
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: 0
        at java.lang.String.charAt(String.java:558)
        at com.jcraft.jsch.ChannelSftp.remoteAbsolutePath(ChannelSftp.java:2361)
        at com.jcraft.jsch.ChannelSftp.mkdir(ChannelSftp.java:1684)
        ... 26 more
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 10 seconds
[INFO] Finished at: Sun Jan 27 00:00:34 CET 2013
[INFO] Final Memory: 33M/59M
[INFO] ------------------------------------------------------------------------