diff --git a/examples/renderTest.php b/examples/renderTest.php
index 1fa3332..a8d725a 100644
--- a/examples/renderTest.php
+++ b/examples/renderTest.php
@@ -228,9 +228,10 @@ foreach($taskModel->childsParams as $childParams){
             return $childParams->defaultMat;
         }
     })($childParams);
-    $textureScaleU = $taskModel->uvScale*(MAT_STANDARD_SIZE/$matOriginal->width);
-    $textureScaleV = $taskModel->uvScale*(MAT_STANDARD_SIZE/$matOriginal->height);
+    
     if(is_object($matOriginal)){
+        $textureScaleU = $taskModel->uvScale*(MAT_STANDARD_SIZE/$matOriginal->width);
+        $textureScaleV = $taskModel->uvScale*(MAT_STANDARD_SIZE/$matOriginal->height);
         $material = createLuxcoreMat($matOriginal, $textureScaleU, $textureScaleV, $downloadDir, $scene);
     }else{
         $material = new Disney();