java.lang.NullPointerException
        at org.netbeans.modules.scala.debugger.projects.EditorContextImpl.removeAnnotation(EditorContextImpl.java:329)
        at org.netbeans.modules.scala.debugger.projects.EditorContextImpl.removeAnnotation(EditorContextImpl.java:324)
        at org.netbeans.modules.debugger.jpda.ui.EditorContextBridge$CompoundContextProvider.removeAnnotation(EditorContextBridge.java:419)
        at org.netbeans.modules.debugger.jpda.ui.CurrentThreadAnnotationListener$2.run(CurrentThreadAnnotationListener.java:226)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:561)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:986)