Cannot save customised Form due to Savetime error

ERPNext
1

Got this error when I’m trying save a customised form.

{“exception”:“frappe.exceptions.TimestampMismatchError: Error: Document has been modified after you have opened it (2026-03-24 14:10:02.987295, None). Please refresh to get the latest document.”,“exc_type”:“TimestampMismatchError”,“exc”:“[\“Traceback (most recent call last):\\n File \\\“apps/frappe/frappe/app.py\\\”, line 120, in application\\n response = frappe.api.handle(request)\\n ^^^^^^^^^^^^^^^^^^^^^^^^^^\\n File \\\“apps/frappe/frappe/api/_init_.py\\\”, line 52, in handle\\n data = endpoint(**arguments)\\n ^^^^^^^^^^^^^^^^^^^^^\\n File \\\“apps/frappe/frappe/api/v1.py\\\”, line 40, in handle_rpc_call\\n return frappe.handler.handle()\\n ^^^^^^^^^^^^^^^^^^^^^^^\\n File \\\“apps/frappe/frappe/handler.py\\\”, line 53, in handle\\n data = execute_cmd(cmd)\\n ^^^^^^^^^^^^^^^^\\n File \\\“apps/frappe/frappe/handler.py\\\”, line 86, in execute_cmd\\n return frappe.call(method, **frappe.form_dict)\\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\\n File \\\“apps/frappe/frappe/_init_.py\\\”, line 1764, in call\\n return fn(*args, **newargs)\\n ^^^^^^^^^^^^^^^^^^^^\\n File \\\“apps/frappe/frappe/handler.py\\\”, line 322, in run_doc_method\\n doc.check_if_latest()\\n File \\\“apps/frappe/frappe/model/document.py\\\”, line 867, in check_if_latest\\n frappe.msgprint(\\n File \\\“apps/frappe/frappe/_init_.py\\\”, line 584, in msgprint\\n _raise_exception()\\n File \\\“apps/frappe/frappe/_init_.py\\\”, line 535, in _raise_exception\\n raise exc\\nfrappe.exceptions.TimestampMismatchError: Error: Document has been modified after you have opened it (2026-03-24 14:10:02.987295, None). Please refresh to get the latest document.\\n\”]”,“_server_messages”:“[\”{\\\“message\\\”: \\\“Error: Document has been modified after you have opened it (2026-03-24 14:10:02.987295, None). Please refresh to get the latest document.\\\”, \\\“title\\\”: \\\“Message\\\”, \\\“indicator\\\”: \\\“red\\\”, \\\“raise_exception\\\”: 1, \\\“__frappe_exc_id\\\”: \\\“db2eec0c1000ca781d93ea19dad62ba92ed93c001a151363a82821c6\\\”}\“]”}

Does not work even I have tried browser refresh & server restart.

Looks like the payload does not include correct modified timestamp :: [],“label”:“”,“search_fields”:“project_name,customer,+status,+priority,+is_active”,“autoname”:“format:+A-{########}”,“title_field”:“customer”,“default_view”:“List”,“sort_field”:“modified”,“__unsaved”:1}

Anyone facing this before?

2

first refresh the page, and then do your changes and save

3

Thanks Kumar for your reply.

But I have refreshed the page & it doesn’t work.

I thk what happens is — the frontend is not sending the datetime for the server to match. → (2026-03-24 14:10:02.987295, None)

4

This usually happens when the Customize Form record was modified in another session or the cached version is stale.

Try these steps:

  1. Hard refresh browser (Ctrl+Shift+R)

  2. Close other tabs/users editing the same Customize Form

  3. Run:

bench clear-cache
bench clear-website-cache
bench restart
  1. Reload the doc and save again.

If still failing, check for custom scripts/hooks updating the Customize Form on load/save.

Also ensure your site and apps are on matching versions after any recent update/migration.