HEAD request return 500 error

[VNIT]

Hello!

I have been install WHMCS but when I run HEAD request some links return error "HTTP/1.1 500 Internal Server Error", but GET request return 200.

Here is an log.

--------- Curl 500 error ---

curl -I https://dev.xxx.vn/clientarea.php
HTTP/1.1 500 Internal Server Error
Server: nginx
Date: Wed, 11 Dec 2019 02:57:00 GMT
Content-Type: text/html; charset=utf-8
Connection: keep-alive
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache
Set-Cookie: WHMCSXXHPYrjnrOmu=an0c3o6sul5jd74vtcbnsic786; path=/; secure; HttpOnly
Vary: User-Agent

---- other link return 200 --

curl -I https://dev.xxx.vn/index.php?rp=/knowledgebase
HTTP/1.1 200 OK
Server: nginx
Date: Wed, 11 Dec 2019 03:13:26 GMT
Content-Type: text/html; charset=utf-8
Content-Length: 117653
Connection: keep-alive
Vary: Accept-Encoding
X-Powered-By: PHP/7.3.12
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache
Set-Cookie: WHMCSXXHPYrjnrOmu=d4r3gihommik9invlaueg27ana; path=/; secure; HttpOnly
Vary: User-Agent

Any one have solution for this ?