java.lang.NullPointerException
        at org.netbeans.modules.python.editor.PythonAstUtils.getNameRange(PythonAstUtils.java:277)
        at org.netbeans.modules.python.editor.PythonOccurrencesMarker.run(PythonOccurrencesMarker.java:236)
        at org.netbeans.modules.python.editor.PythonOccurrencesMarker.run(PythonOccurrencesMarker.java:69)
        at org.netbeans.modules.gsfret.editor.semantic.MarkOccurrencesHighlighter.processImpl(MarkOccurrencesHighlighter.java:173)
        at org.netbeans.modules.gsfret.editor.semantic.MarkOccurrencesHighlighter.run(MarkOccurrencesHighlighter.java:113)
        at org.netbeans.modules.gsfret.editor.semantic.MarkOccurrencesHighlighter.run(MarkOccurrencesHighlighter.java:80)
        at org.netbeans.napi.gsfret.source.Source$CompilationJob.run(Source.java:1417)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
        at java.util.concurrent.FutureTask.run(FutureTask.java:138)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619)