Since 3.97v it was to weak for nowadays purposes. If you have present installation I suggest it to change to at-least 50 characters string. 80 recommended and include special characters.

https://github.com/LiveHelperChat/livehelperchat/blob/master/lhc_web/settings/settings.ini.default.php#L12

In 3.97v there is few new settings. If you are missing them you can add them in your settings/settings.ini.php file under site section.

'site_address' => 'https://demo.livehelperchat.com',
'trusted_host_patterns' => [
     '^demo\.livehelperchat\.com$', // Explicit domain
     '^.+\.livehelperchat\.com$',   // Any subdomain
],

Location in default configuration

https://github.com/LiveHelperChat/livehelperchat/blob/master/lhc_web/settings/settings.ini.default.php#L29-L31

As with secrethash same situation with Export hash

Export hash can be changed in.

System configuration > Live Help configuration > Chat configuration > Misc > Chats export secret hash

Set it to at-least 50 characters length.