diff --git a/src/src/Rendering/Viewer/VolumeRenderingViewer.cpp b/src/src/Rendering/Viewer/VolumeRenderingViewer.cpp
index bc61718..c79198e 100644
--- a/src/src/Rendering/Viewer/VolumeRenderingViewer.cpp
+++ b/src/src/Rendering/Viewer/VolumeRenderingViewer.cpp
@@ -13,13 +13,11 @@
 #include <vtkImageData.h>
 #include <vtkVolume.h>
 #include <vtkVolumeProperty.h>
-//#include <vtkSmartVolumeMapper.h>
 #include <vtkFixedPointVolumeRayCastMapper.h>
 #include <vtkGPUVolumeRayCastMapper.h>
 #include <vtkPiecewiseFunction.h>
 #include <vtkColorTransferFunction.h>
 #include <vtkCornerAnnotation.h>
-#include <vtkLODProp3D.h>
 
 vtkStandardNewMacro(VolumeRenderingViewer);
 
@@ -217,7 +215,7 @@ void VolumeRenderingViewer::SetRenderer(vtkRenderer *arg) {
 }
 
 void VolumeRenderingViewer::Render() {
-    if (RenderWindow){
+    if (RenderWindow && Interactor){
         Interactor->Render();
     }
 }
@@ -241,6 +239,5 @@ void VolumeRenderingViewer::printFrameRate() {
     double fps = 1.0 / timeInSeconds;
     char buff[200]={0};
     sprintf(buff,"FPS:%3.0f", fps);
-//    sprintf(buff,"FPS:%3.0f,bytes in use:%lld", fps,vtkGPUVolumeRayCastMapper::SafeDownCast(lowresMapper)->GetMaxMemoryInBytes());
     annotation->SetText(0,buff );
 }