diff --git a/application/Espo/Resources/metadata/fields/attachmentMultiple.json b/application/Espo/Resources/metadata/fields/attachmentMultiple.json
index bf761e3936..406371937b 100644
--- a/application/Espo/Resources/metadata/fields/attachmentMultiple.json
+++ b/application/Espo/Resources/metadata/fields/attachmentMultiple.json
@@ -40,6 +40,5 @@
    },
    "notSortable": true,
    "filter": true,
-   "hookClassName": "\\Espo\\Core\\Utils\\FieldManager\\Hooks\\AttachmentMultipleType",
    "personalData": true
 }