NPE with FindBugs 1.1.1

After updating FindBugs to the latest version I am experiencing the
following NPE

java.lang.NullPointerException
        at 
edu.umd.cs.findbugs.ba.npe.IsNullValueFrame.setTop(IsNullValueFrame.java:65)
        at 
edu.umd.cs.findbugs.ba.FrameDataflowAnalysis.initResultFact(FrameDataflowAnalysis.java:42)
        at 
edu.umd.cs.findbugs.ba.FrameDataflowAnalysis.initResultFact(FrameDataflowAnalysis.java:32)
        at edu.umd.cs.findbugs.ba.Dataflow.<init>(Dataflow.java:82)
        at 
edu.umd.cs.findbugs.ba.AbstractDataflow.<init>(AbstractDataflow.java:42)
        at 
edu.umd.cs.findbugs.ba.npe.IsNullValueDataflow.<init>(IsNullValueDataflow.java:29)
        at edu.umd.cs.findbugs.ba.ClassContext$3.analyze(ClassContext.java:558)
        at edu.umd.cs.findbugs.ba.ClassContext$3.analyze(ClassContext.java:544)
        at 
edu.umd.cs.findbugs.ba.ClassContext$AnalysisFactory.getAnalysis(ClassContext.java:251)
        at 
edu.umd.cs.findbugs.ba.ClassContext.getIsNullValueDataflow(ClassContext.java:1200)
        at 
edu.umd.cs.findbugs.detect.FindNullDeref.analyzeMethod(FindNullDeref.java:192)
        at 
edu.umd.cs.findbugs.detect.FindNullDeref.visitClassContext(FindNullDeref.java:157)
        at 
edu.umd.cs.findbugs.DetectorToDetector2Adapter.visitClass(DetectorToDetector2Adapter.java:64)
        at edu.umd.cs.findbugs.FindBugs2.analyzeApplication(FindBugs2.java:608)
        at edu.umd.cs.findbugs.FindBugs2.execute(FindBugs2.java:174)
        ....

Any ideas, comments?

-Sven