Getting exception when triggering downstream job.

Hudson: 1.231
OS: Centos
Standard build type

The upstream build is setting its status to "success", however the downstream is not triggered.

I've tried this with "Trigger even if the build is unstable" both checked and unchecked.  No dice.

The following stack is the last items of the upstream console.

FATAL: Index: 0, Size: 0
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
        at java.util.ArrayList.RangeCheck(ArrayList.java:546)
        at java.util.ArrayList.get(ArrayList.java:321)
        at hudson.model.DependencyGraph.sort(DependencyGraph.java:364)
        at hudson.tasks.BuildTrigger.execute(BuildTrigger.java:132)
        at hudson.model.Build$RunnerImpl.cleanUp(Build.java:125)
        at hudson.model.Run.run(Run.java:815)
        at hudson.model.Build.run(Build.java:85)
        at hudson.model.ResourceController.execute(ResourceController.java:70)
        at hudson.model.Executor.run(Executor.java:85)