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Request time out when we save doctype contact

Hi

We have an issue on save contact.
if we choose email is_primary like this


System will show error message Request Time Out after click save
Chrome shows messages below.

web.error.log show message
[2021-10-11 15:59:34 +0800] [27226] [CRITICAL] WORKER TIMEOUT (pid:27260)

[2021-10-11 15:59:34 +0800] [27260] [INFO] Worker exiting (pid: 27260)

[2021-10-11 15:59:34 +0800] [47218] [INFO] Booting worker with pid: 47218

We don’t know how to fix the issue, please help.
By the way, if we don’t choose is primary , then everything is just fine.

erpnext version: 13.12.1
frappe version: 13.12.1

Thanks.