diff --git a/common/rfb/ScaledPixelBuffer.cxx b/common/rfb/ScaledPixelBuffer.cxx
index e45274e..cd37338 100644
--- a/common/rfb/ScaledPixelBuffer.cxx
+++ b/common/rfb/ScaledPixelBuffer.cxx
@@ -111,7 +111,7 @@
     freeWeightTabs();
     scaleFilters.makeWeightTabs(scaleFilterID, src_width, scaled_width, &xWeightTabs);
     scaleFilters.makeWeightTabs(scaleFilterID, src_height, scaled_height, &yWeightTabs);
-    if (scale != 100 && pf.depth > 0) scaleRect(Rect(0, 0, src_width, src_height));
+    if (scale != 100 && pf.depth > 0 && scaled_data) scaleRect(Rect(0, 0, src_width, src_height));
   }
 }