java.lang.NullPointerException
   at org.netbeans.api.debugger.DebuggerManager.refreshDebuggerManagerListeners(DebuggerManager.java:1549)
   at org.netbeans.api.debugger.DebuggerManager.initDebuggerManagerListeners(DebuggerManager.java:1524)
   at org.netbeans.api.debugger.DebuggerManager.initBreakpoints(DebuggerManager.java:996)
   at org.netbeans.api.debugger.DebuggerManager.initBreakpoints(DebuggerManager.java:965)
   at org.netbeans.api.debugger.DebuggerManager.getBreakpoints(DebuggerManager.java:603)
   at org.netbeans.modules.python.debugger.breakpoints.BreakpointAnnotationListener.annotate(BreakpointAnnotationListener.java:143)
   at org.openide.text.CloneableEditorSupport.ensureAnnotationsLoaded(CloneableEditorSupport.java:393)
   at org.openide.text.CloneableEditorInitializer.initAnnotations(CloneableEditorInitializer.java:643)
   at org.openide.text.CloneableEditorInitializer.run(CloneableEditorInitializer.java:351)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)