diff --git a/web/modules/custom/images_styles_gen/src/CreateImagesStyles.php b/web/modules/custom/images_styles_gen/src/CreateImagesStyles.php
index 4703553b..21d24838 100644
--- a/web/modules/custom/images_styles_gen/src/CreateImagesStyles.php
+++ b/web/modules/custom/images_styles_gen/src/CreateImagesStyles.php
@@ -8,7 +8,7 @@ namespace Drupal\images_styles_gen;
 class CreateImagesStyles {
 
   public static function createStyles($item, &$context){
-    if (!$context['sandbox']['progress']) {
+    if (!array_key_exists('progress', $context['sandbox'])) {
       $context['sandbox']['progress'] = 0;
     }
     $context['sandbox']['progress']++;