[Bug] Adding/Editing IP will cause 500 internal server error

[tenent007963]

Describe the bug

Editing or adding new IP in Network section will cause a temporary 500 internal server error, no changes are saved during the error.
Investigating the log and network requests indicates a "v_owner" variable is missing from the POST request, and exceptions not handled properly.

Tell us how to replicate the bug

1. Click "Server Settings"
2. Click "Configure"
3. Click "Network"
4. Add IP Address/Edit IP Address
5. make changes and click "Save"

Which components are affected by this bug?

Firewall (Iptables, Fail2ban)

Hestia Control Panel Version

1.8.11

Operating system

Ubuntu 20.04

Log capture

[error] 1109#0: *199 FastCGI sent in stderr: "PHP message: PHP Warning:  Undefined array key "v_owner" in /usr/local/hestia/web/add/ip/index.php on line 51; 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/add/ip/index.php on line 51 and defined in /usr/local/hestia/web/inc/vendor/hestiacp/phpquoteshellarg/src/Hestiacp/quoteshellarg/quoteshellarg.php:14

[tenent007963]

Temporary fix:
Using inspect element, find v_owner select tag and add this line in it:
<option name="admin">admin</option>

[jaapmarcus]

Known issue it has been fixed allready in the codebase

[tenent007963]

Are you by any chance referring to this code block?

<div x-cloak x-show="!showUserTable" id="usrtable">
	<div class="u-mb10">
		<label for="v_owner" class="form-label"><?= _("Assigned User") ?></label>
		<select class="form-select" name="v_owner" id="v_owner">
			<?php
				foreach ($users as $key => $value) {
					echo "\t\t\t\t<option value=\"".htmlentities($value)."\"";
					if ((!empty($v_owner)) && ( $value == $v_owner )) echo ' selected';
					echo ">".htmlentities($value)."</option>\n";
				}
			?>
		</select>
	</div>
</div>

If yes, then I'm afraid this is the exact code that is causing the control panel to not give any available options to select. I've check the last updated version of add_ip.php together with the latest release version, apparently it doesn't work as intended.