diff --git a/core/permissions.php b/core/permissions.php
index aedf3a5c..0cf1d9c4 100644
--- a/core/permissions.php
+++ b/core/permissions.php
@@ -118,5 +118,5 @@ abstract class Permissions
     public const BULK_IMPORT = "bulk_import";
     public const BULK_EXPORT = "bulk_export";
     public const BULK_DOWNLOAD = "bulk_download";
-	public const BULK_PARENT_CHILD = "bulk_parent_child";
+    public const BULK_PARENT_CHILD = "bulk_parent_child";
 }
diff --git a/core/userclass.php b/core/userclass.php
index 5e66256c..22d2f698 100644
--- a/core/userclass.php
+++ b/core/userclass.php
@@ -223,7 +223,7 @@ new UserClass("admin", "base", [
     Permissions::BULK_IMPORT =>true,
     Permissions::BULK_EXPORT =>true,
     Permissions::BULK_DOWNLOAD => true,
-	Permissions::BULK_PARENT_CHILD => true,
+    Permissions::BULK_PARENT_CHILD => true,
 
     Permissions::SET_PRIVATE_IMAGE => true,
     Permissions::SET_OTHERS_PRIVATE_IMAGES => true,
diff --git a/ext/bulk_parent_child/main.php b/ext/bulk_parent_child/main.php
index 296c9af8..b7eda773 100644
--- a/ext/bulk_parent_child/main.php
+++ b/ext/bulk_parent_child/main.php
@@ -27,15 +27,15 @@ class BulkParentChild extends Extension
     public function onBulkAction(BulkActionEvent $event)
     {
         global $user, $page, $config;
-		if ($user->can(Permissions::BULK_PARENT_CHILD)&&
+        if ($user->can(Permissions::BULK_PARENT_CHILD)&&
             ($event->action == BulkParentChild::PARENT_CHILD_ACTION_NAME)) {
-				 $prev_id = null;
-				 foreach ($event->items as $image) {
-					 if ($prev_id != null) {
-						send_event(new ImageRelationshipSetEvent($image->id, $prev_id));
-					 }
-					 $prev_id = $image->id;
-				 }
-			}
+            $prev_id = null;
+            foreach ($event->items as $image) {
+                if ($prev_id != null) {
+                    send_event(new ImageRelationshipSetEvent($image->id, $prev_id));
+                }
+                $prev_id = $image->id;
+            }
+        }
     }
 }