PHP Warning: Undefined array key 0/1 in page indexer TYPO3 11.5 / PHP 8.1

[KHReinhardt]

I get the following PHP warnings at some point if I run indexing with the page indexer in ke_search 4.6.2. Many pages can be indexed though. Any hints as to how to fix this?
PHP Warning: Undefined array key 0 in \ke_search\Classes\Indexer\Types\Page.php line 691
PHP Warning: Undefined array key 1 in \ke_search\Classes\Indexer\Types\Page.php line 691

[KHReinhardt]

As a workaround I changed all content elements with sys_language_uid = -1 to sys_language_uid = 0 in the tt_content table. But that only works for us because there are not so many, since we need to provide them in another language version.

[christianbltr]

For reference, this has been fixed with

d0a8920

and

5a9ce70