Auto-attack countdown link redirects to e-hentai.org/null (404) on Firefox

[OozoraAhiru]

Environment

• Browser: Firefox (152.0.4 (64-bit), latest), Ubuntu
• Userscript manager: Greasemonkey 4.14
• Script: HV Auto Attack, version 2.91.34

Description

When manually clicking the auto-attack countdown number to enter battle, the browser is redirected first to:

'https://e-hentai.org/news.php?encounter'

and then to:

'https://e-hentai.org/null'

which returns a 404 Not Found. As a result, the battle page never loads and the script cannot proceed with the auto-attack sequence.

Steps to Reproduce

1. Use Firefox (latest) on Ubuntu with Greasemonkey 4.14 installed.
2. Install/run HV Auto Attack script v2.91.34 on hentaiverse.org.
3. Click on the countdown number to trigger battle entry.
4. Observe the browser navigates to 'https://e-hentai.org/news.php?encounter', then to 'https://e-hentai.org/null' (404).

Additional Notes

• When Greasemonkey disabled, 'https://e-hentai.org/news.php?encounter' does not redirect to '/null'.
• This issue does not reproduce on Chrome-family browsers (Chrome/Chromium/Brave, etc.) with the same script version. Manual battle entry and return to hentaiverse.org work correctly there.

[WayneFerdon]

It seems that the url https://e-hentai.org/null is from line:962, in which url is null( or 'null'?).

line:962 ...`${g().option?.altBattleFirst ? location.replace('hentaiverse.org', 'alt.hentaiverse.org').replace('alt.alt', 'alt') : location}/${url}`...

However, in line:941, a null url should be skipped by a early return (at least in chrome is so).

line:941 if (!url) {
   ...
   return false;
}

Meanwhile the location should be HV yet EH is resulted in

line:862 if (window.location.host !== 'e-hentai.org') {
              if (isMaintaining) {
                ...
                return true;
              }
line:882   setValue('url', window.location.origin); // The only line setting 'url', and only at `window.location.host !== 'e-hentai.org'`
              ...
            }
line:914 let location = getValue('url') ?? (document.referrer.match('hentaiverse.org') ? new URL(document.referrer).origin : 'https://hentaiverse.org');

So try checking script data in Greasemonkey ( to find out if any encounter url is 'null' or the data object with key 'url' is with a value of 'null') and see if cleaning the data will fix the issue.
Otherwise, try to check whether the url and location are assigned correctly in DevTool.