NPE when building OSGi bundles with Maven Tycho - eclipse

Question

I have several OSGi-bundles that I want to build using Maven Tycho. While the dependencies of the first 4 bundles can be resolved without problem, Tycho quits with the following cryptic exception at the 5th:
[INFO] Resolving dependencies of MavenProject: my.parent:my.module:0.0.1-SNAPSHOT # D:\Path\To\Project\pom.xml
[WARNING] The following locally built units have been used to resolve project dependencies:
[WARNING] my-other-module/0.0.1.201407011334
[INFO] Resolving class path of MavenProject: my.parent:my.module:0.0.1-SNAPSHOT # D:\Path\To\Project\pom.xml
[ERROR] Internal error: java.lang.NullPointerException -> [Help 1]
org.apache.maven.InternalErrorException: Internal error: java.lang.NullPointerException
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:167)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:584)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:213)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:157)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: java.lang.NullPointerException
at org.eclipse.tycho.core.osgitools.OsgiBundleProject.resolveClassPath(OsgiBundleProject.java:187)
at org.eclipse.tycho.core.resolver.DefaultTychoDependencyResolver.resolveProject(DefaultTychoDependencyResolver.java:122)
at org.eclipse.tycho.core.maven.TychoMavenLifecycleParticipant.afterProjectsRead(TychoMavenLifecycleParticipant.java:75)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:317)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:155)
... 11 more
Following is the MANIFEST.MF of that bundle (Import-Package section):
Import-Package: my.other.module.package;version="[0.0,1)",
org.apache.commons.lang3.builder;version="[3.3,4)",
org.dozer;version="[5.5,6)",
org.osgi.service.blueprint;version="[1.0.0,2.0.0)"
Resolving the dependencies from the repository shouldn't be a problem, as launching the bundles from within eclipse works fine.
Interesting aspect: I'm working on Windows 7x64. On my coworker's pc with Linux it runs fine.
I'm not really sure where to start finding the error - the exception doesn't really give a hint, so I'd appreciate every tip. If you need further information, I'd be happy to clarify.