diff --git a/admin/Ilove_Img_Wm_Process.php b/admin/Ilove_Img_Wm_Process.php
index 7030bdd..95f782b 100644
--- a/admin/Ilove_Img_Wm_Process.php
+++ b/admin/Ilove_Img_Wm_Process.php
@@ -87,7 +87,7 @@ public function watermark( $images_id ) {
 
                     $images_restore = array_unique( $images_restore );
 
-					update_option( 'iloveimg_images_to_restore', wp_json_encode( $images_restore ) );
+					update_option( 'iloveimg_images_to_restore', wp_json_encode( $images_restore, JSON_FORCE_OBJECT ) );
                 }
 
                 foreach ( $_sizes as $_size ) {