[Resolved] Warning in media attachement because of holes in array

For some reasons, your AI replaced all the code I added into my original answer 🙁

The bug in your code is that you are expecting $urls to have adjacent keys, which is not guaranteed.

So, this loop:

                $urls_count = count( $urls );
                for ( $i = 0; $i < $urls_count; $i++ ) {
                        $index = md5( $language . $urls[ $i ] );
                        $this->setItemToCache( null, 'id_from_guid_cache', $index );
                }

must be rewritten as such:

                foreach ( $urls as $url ) {
                        $index = md5( $language . $url );
                        $this->setItemToCache( null, 'id_from_guid_cache', $index );
                }

And the same the in second function for $pathes.

Otherwise, you will access invalid ids and you will also not access all elements since you will stop early.

I have applied this code change and the warning went away.

Can you please do this change (or something of the sort to avoid the warning) in your code to fix the warning for everybody?

Yes, I am using the latest versions of all WPML plugins.

I don't have any fresh installation of WordPress to test.

I have done some testing on the test installation, but without having access to the PHP Logs, I do not know whether the warnings are there or not.