java.lang.NullPointerException
        at org.netbeans.modules.javafx.debugger.Context.getCurrentLineNumber(Context.java:80)
        at org.netbeans.modules.javafx.debugger.actions.JavaFXToggleActionProvider.doAction(JavaFXToggleActionProvider.java:52)
        at org.netbeans.spi.debugger.ActionsProvider$1.run(ActionsProvider.java:112)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:602)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1084)
Caused: org.openide.util.RequestProcessor$FastItem: task failed due to: java.lang.NullPointerException