NPE in the resolver when substituting

2014-09-17 11:01:13,035 | ERROR | agent-5-thread-1 | DeploymentAgent                  | ?                                   ? | 76 - io.fabric8.fabric-agent - 1.2.0.SNAPSHOT | Unable to update agent
java.lang.NullPointerException
	at org.apache.felix.resolver.ResolverImpl.permutateIfNeeded(ResolverImpl.java:1523)[76:io.fabric8.fabric-agent:1.2.0.SNAPSHOT]
	at org.apache.felix.resolver.Candidates.checkSubstitutes(Candidates.java:447)[76:io.fabric8.fabric-agent:1.2.0.SNAPSHOT]
	at org.apache.felix.resolver.ResolverImpl.resolve(ResolverImpl.java:225)[76:io.fabric8.fabric-agent:1.2.0.SNAPSHOT]
	at io.fabric8.agent.DeploymentBuilder.resolve(DeploymentBuilder.java:243)[76:io.fabric8.fabric-agent:1.2.0.SNAPSHOT]
	at io.fabric8.agent.DeploymentAgent.doUpdate(DeploymentAgent.java:588)[76:io.fabric8.fabric-agent:1.2.0.SNAPSHOT]
	at io.fabric8.agent.DeploymentAgent$2.run(DeploymentAgent.java:313)[76:io.fabric8.fabric-agent:1.2.0.SNAPSHOT]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)[:1.7.0_51]
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)[:1.7.0_51]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)[:1.7.0_51]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)[:1.7.0_51]
	at java.lang.Thread.run(Thread.java:744)[:1.7.0_51]