Internal Server Error when exim4 is disabled

[skwii]

Hello, wonderful community of HestiaCP!

The installation was done by my hoster, they have it pre-installed, so I can’t exclude exim4 in advance.
I think this is a mistake, because if exim4 was needed once and now it is not used and needs to be disabled, and this breaks HestiaCP.
I ran into an error when disabling everything extra, found on the forum HestiaCP disabling exim4 like this.

sudo systemctl stop exim4;
sudo systemctl disable exim4;
nano /usr/local/hestia/conf/hestia.conf

MAIL_SYSTEM=‘’

It is after this disconnection, or rather, after its removal of the variable value, that the service can work, but if you remove MAIL_SYSTEM=‘’ from the variable, in this case, after any saving of settings, an internal server error 500 is returned, redirecting to page 500 from HestiaCP.

How can this be fixed?

[eris]

What is the error in /var/log/hestia/nginx-error.log?

[skwii]

Hid the data at the end

client: (My IP was here.)

and

host: “Here was my Hostname”

[error] 617#0: *6 FastCGI sent in stderr: "PHP message: PHP Warning:  Undefined array key "v_php_versions" in /usr/local/hestia/web/edit/server/index.php on line 291; PHP message: PHP Warning:  Undefined array key "v_debug_mode" in /usr/local/hestia/web/edit/server/index.php on line 410; PHP message: PHP Warning:  Undefined array key "v_webmail_alias" in /usr/local/hestia/web/edit/server/index.php on line 598; PHP message: PHP Warning:  Undefined array key "v_webmail_alias" in /usr/local/hestia/web/edit/server/index.php on line 600; PHP message: PHP Fatal error:  Uncaught TypeError: Hestiacp\quoteshellarg\quoteshellarg(): Argument #1 ($arg) must be of type string, null given, called in /usr/local/hestia/web/edit/server/index.php on line 600 and defined in /usr/local/hestia/web/inc/vendor/hestiacp/phpquoteshellarg/src/Hestiacp/quoteshellarg/quoteshellarg.php:14
Stack trace:
#0 /usr/local/hestia/web/edit/server/index.php(600): Hestiacp\quoteshellarg\quoteshellarg()
#1 {main}
  thrown in /usr/local/hestia/web/inc/vendor/hestiacp/phpquoteshellarg/src/Hestiacp/quoteshellarg/quoteshellarg.php on line 14" while reading response header from upstream, client: MY_IP, server: _, request: "POST /edit/server/ HTTP/2.0", upstream: "fastcgi://unix:/run/hestia-php.sock:", host: "MY_HOSTNAME:8083", 

This is the last entry I reproduced the error again and this error immediately occurred.
There are other errors if you need to, let me know they are not many as the install is clean.

[skwii]

Please help) I will be very grateful, besides, the mistake is unpleasant

[eris]

The issue should be fixed if you install 1.8.4

[skwii]

Yeah that worked out great!
You are the best, thank you, for your work!