diff --git a/backend/src/services/identity-ldap-auth/identity-ldap-auth-service.ts b/backend/src/services/identity-ldap-auth/identity-ldap-auth-service.ts
index 6b55d1917..916fa1f9b 100644
--- a/backend/src/services/identity-ldap-auth/identity-ldap-auth-service.ts
+++ b/backend/src/services/identity-ldap-auth/identity-ldap-auth-service.ts
@@ -422,6 +422,8 @@ export const identityLdapAuthServiceFactory = ({
       });
     }
 
+    if (allowedFields) AllowedFieldsSchema.array().parse(allowedFields);
+
     const updatedLdapAuth = await identityLdapAuthDAL.updateById(identityLdapAuth.id, {
       url,
       searchBase,