diff --git a/Sources/Rendering/OpenGL/Framebuffer/index.js b/Sources/Rendering/OpenGL/Framebuffer/index.js
index d8c2088e07a..2cd9787e203 100644
--- a/Sources/Rendering/OpenGL/Framebuffer/index.js
+++ b/Sources/Rendering/OpenGL/Framebuffer/index.js
@@ -225,12 +225,8 @@ function vtkFramebuffer(publicAPI, model) {
   };
 
   publicAPI.getSize = () => {
-    const size = [0, 0];
-    if (model.glFramebuffer !== null) {
-      size[0] = model.glFramebuffer.width;
-      size[1] = model.glFramebuffer.height;
-    }
-    return size;
+    if (model.glFramebuffer == null) return null;
+    return [model.glFramebuffer.width, model.glFramebuffer.height];
   };
 
   publicAPI.populateFramebuffer = () => {
diff --git a/Sources/Rendering/OpenGL/HardwareSelector/index.js b/Sources/Rendering/OpenGL/HardwareSelector/index.js
index 2232f4f5119..386e4391e49 100644
--- a/Sources/Rendering/OpenGL/HardwareSelector/index.js
+++ b/Sources/Rendering/OpenGL/HardwareSelector/index.js
@@ -357,7 +357,7 @@ function vtkOpenGLHardwareSelector(publicAPI, model) {
       model.framebuffer.setOpenGLRenderWindow(model._openGLRenderWindow);
       model.framebuffer.saveCurrentBindingsAndBuffers();
       const fbSize = model.framebuffer.getSize();
-      if (fbSize[0] !== size[0] || fbSize[1] !== size[1]) {
+      if (!fbSize || fbSize[0] !== size[0] || fbSize[1] !== size[1]) {
         model.framebuffer.create(size[0], size[1]);
         // this calls model.framebuffer.bind()
         model.framebuffer.populateFramebuffer();
diff --git a/Sources/Rendering/OpenGL/RenderWindow/index.js b/Sources/Rendering/OpenGL/RenderWindow/index.js
index a0af331fc8c..4494243a3a1 100644
--- a/Sources/Rendering/OpenGL/RenderWindow/index.js
+++ b/Sources/Rendering/OpenGL/RenderWindow/index.js
@@ -218,10 +218,8 @@ function vtkOpenGLRenderWindow(publicAPI, model) {
   };
 
   publicAPI.getFramebufferSize = () => {
-    if (model.activeFramebuffer) {
-      return model.activeFramebuffer.getSize();
-    }
-    return model.size;
+    const fbSize = model.activeFramebuffer?.getSize();
+    return fbSize || model.size;
   };
 
   publicAPI.getPixelData = (x1, y1, x2, y2) => {
diff --git a/Sources/Rendering/OpenGL/SurfaceLIC/LineIntegralConvolution2D/index.js b/Sources/Rendering/OpenGL/SurfaceLIC/LineIntegralConvolution2D/index.js
index 95daae20cf2..76b1fbe0a4c 100644
--- a/Sources/Rendering/OpenGL/SurfaceLIC/LineIntegralConvolution2D/index.js
+++ b/Sources/Rendering/OpenGL/SurfaceLIC/LineIntegralConvolution2D/index.js
@@ -202,7 +202,8 @@ function vtkLineIntegralConvolution2D(publicAPI, model) {
     const gl = model.context;
 
     let fb = model.framebuffer;
-    if (!fb || size[0] !== fb.getSize()[0] || size[1] !== fb.getSize()[1]) {
+    const fbSize = fb.getSize();
+    if (!fb || !fbSize || size[0] !== fbSize || size[1] !== fbSize) {
       fb = vtkFrameBuffer.newInstance();
       fb.setOpenGLRenderWindow(model._openGLRenderWindow);
       fb.saveCurrentBindingsAndBuffers();
diff --git a/Sources/Rendering/OpenGL/VolumeMapper/index.js b/Sources/Rendering/OpenGL/VolumeMapper/index.js
index 1485acf56ee..772b43393a2 100644
--- a/Sources/Rendering/OpenGL/VolumeMapper/index.js
+++ b/Sources/Rendering/OpenGL/VolumeMapper/index.js
@@ -1218,7 +1218,7 @@ function vtkOpenGLVolumeMapper(publicAPI, model) {
         model.framebuffer.populateFramebuffer();
       } else {
         const fbSize = model.framebuffer.getSize();
-        if (fbSize[0] !== size[0] || fbSize[1] !== size[1]) {
+        if (!fbSize || fbSize[0] !== size[0] || fbSize[1] !== size[1]) {
           model.framebuffer.create(size[0], size[1]);
           model.framebuffer.populateFramebuffer();
         }