diff --git a/common/components/artboximage/ArtboxImageHelper.php b/common/components/artboximage/ArtboxImageHelper.php
index a379b21..ed7a3bf 100755
--- a/common/components/artboximage/ArtboxImageHelper.php
+++ b/common/components/artboximage/ArtboxImageHelper.php
@@ -86,7 +86,10 @@ class ArtboxImageHelper extends Object {
         foreach ($preset as $action => $data) {
             switch($action) {
                 case 'resize':
-                    $image->resize($data['width'], $data['height'], @$data['master']);
+                    $width = empty($data['width']) ? null : $data['width'];
+                    $height = empty($data['height']) ? null : $data['height'];
+                    $master = empty($data['master']) ? null : $data['master'];
+                    $image->resize($width, $height, $master);
                     break;
                 case 'flip':
                     $image->flip(@$data['direction']);
--
libgit2 0.21.4