Update LightsDebugState.java

no need to call rm.renderScene(debugNode, debugView)

jme3-core/src/main/java/com/jme3/environment/util/LightsDebugState.java

@@ -220,7 +220,6 @@ public class LightsDebugState extends BaseAppState {
     @Override
     public void render(RenderManager rm) {
         debugNode.updateGeometricState();
-        rm.renderScene(debugNode, viewPort);
     }
 
     /**