diff --git a/lime/graphics/utils/ImageDataUtil.hx b/lime/graphics/utils/ImageDataUtil.hx
index 530c1f106..f17a63fb5 100644
--- a/lime/graphics/utils/ImageDataUtil.hx
+++ b/lime/graphics/utils/ImageDataUtil.hx
@@ -239,6 +239,8 @@ class ImageDataUtil {
 					
 				} else {
 					
+					if (alphaPoint == null) alphaPoint = new Vector2 ();
+					
 					var alphaData = alphaImage.buffer.data;
 					var alphaFormat = alphaImage.buffer.format;
 					var alphaPremultiplied = alphaImage.buffer.premultiplied;