Stale file content.php ?

I noticed an error in the log from a crawler...

[29/Dec/2025:07:22:31 +0100] "GET /content.php HTTP/1.1" 500 737 "https://duckduckgo.com/" "Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/117.0.0.0 Mobile Safari/537.36"

mod_fcgid: stderr: PHP Fatal error:  Uncaught Error: Failed opening required '../../lib/config.inc.php' (include_path='.:/usr/share/php:/usr/local/ispconfig/interface/lib/classes/') in /usr/local/ispconfig/interface/web/dashboard/dashboard.php:30, referer: https://duckduckgo.com/
 mod_fcgid: stderr: Stack trace:, referer: https://duckduckgo.com/
 mod_fcgid: stderr: #0 /usr/local/ispconfig/interface/web/content.php(47): include_once(), referer: https://duckduckgo.com/
 mod_fcgid: stderr: #1 {main}, referer: https://duckduckgo.com/
 mod_fcgid: stderr:   thrown in /usr/local/ispconfig/interface/web/dashboard/dashboard.php on line 30, referer: https://duckduckgo.com/

It's including interface/web/dashboard/dashboard.php, which clearly does not expect to be called from there ... I get the feeling that interface/web/content.php is no longer used.

I don't see any reference to it being used in the codebase.