Hi, how are you?

I need your help, i am using DroidDiagram, when i test my app in Lollipop it works all! But when i test in Nougat crashes.

I debugg it and crashes when i do  layout.arrange(diagrama).

I paste the code to detail more
protected void onCreate(Bundle savedInstanceState) {
         ------------
        diagramView = (DiagramView)findViewById(R.id.diag_view);
        diagram = diagramView.getDiagram();
        -----------
}
And later i do

        LayeredLayout layout = new LayeredLayout();
        layout.setLayerDistance(10);
        layout.setNodeDistance(25);
        layout.setStraightenLongLinks(true);
        layout.arrange(diagrama);

Thx a lot!!