diff --git a/src-ui/src/app/components/document-detail/document-detail.component.ts b/src-ui/src/app/components/document-detail/document-detail.component.ts
index 5e3b6c2a7..c530921c7 100644
--- a/src-ui/src/app/components/document-detail/document-detail.component.ts
+++ b/src-ui/src/app/components/document-detail/document-detail.component.ts
@@ -417,7 +417,7 @@ export class DocumentDetailComponent
               owner: doc.owner,
               set_permissions: doc.permissions,
             },
-            custom_fields: doc.custom_fields,
+            custom_fields: [...doc.custom_fields],
           })
 
           this.isDirty$ = dirtyCheck(