Bug php 8.1 compat issue on redirect during 2fa

[Xon]

Code:

ErrorException: [E_DEPRECATED] substr(): Passing null to parameter #1 ($string) of type string is deprecated src/XF.php:1323
Generated by: Unknown account Feb 3, 2022 at 5:56 AM
Stack trace
#0 [internal function]: XF::handlePhpError(8192, '[E_DEPRECATED] ...', '/var/www/sites/...', 1323)
#1 src/XF.php(1323): substr(NULL, 0, 2)
#2 src/XF/Http/Request.php(1806): XF::convertToAbsoluteUrl(NULL, 'https://xf22tes...')
#3 src/XF/App.php(2230): XF\Http\Request->convertToAbsoluteUri(NULL)
#4...

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