Muli-modules maven projects with relative modules paths using "../" are throwing a NullPointerException.

If a jenkins job contains a pom like:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>my-example</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>pom</packaging>
<modules>
<module>../../../a-job/workspace</module>
</modules>
</project>

where a module path is relative and using "../", a NullPointerException is thrown:

Found mavenVersion 2.2.1 from file jar:file:/home/hudson/.hudson/tools/maven_2.2.1/lib/maven-2.2.1-uber.jar!/META-INF/maven/org.apache.maven/maven-core/pom.properties
No emails were triggered.
Parsing POMs
ERROR: Processing failed due to a bug in the code. Please report this to jenkins-users@googlegroups.com
java.lang.NullPointerException
at hudson.FilePath.isAbsolute(FilePath.java:224)
at hudson.FilePath.<init>(FilePath.java:212)
at hudson.FilePath.child(FilePath.java:894)
at hudson.maven.MavenModuleSetBuild$RunnerImpl.doRun(MavenModuleSetBuild.java:555)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:420)
at hudson.model.Run.run(Run.java:1362)
at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:406)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:145)

(using jenkins 1.398)