$links variable can be undefined when only one language present

@ruuds
how many 'extra' languages did you disable in the project? can you outline this a bit more?

Initially, the project had three active languages (Dutch, Flemish and French). Two of these were removed (Flemish and French), but the dropdown language was left in place because another new language will be added instead soon.

The $links variable is only set when if (count($languages) > 1) so when the module is used when only one language is present, count($links) will always result in this warning.

@SKAUGHT: See https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Language%...

and https://www.drupal.org/node/3247792 →

This explains the issue. So the proposed fix is NOT correct. I'll provide a MR. This should be fixed with a new stable release ASAP.

Please have a look at the links in#4 and my MR. I first thought about providing a [] fallback value but presumably it doesn't make any sense to proceed if there are no links?

Otherwise, replace the return statement by $links = []; and a clear comment that the core method returns NULL but we need an array here.

The alternative approach can be found here: 🐛 Incorporate Drupal 9.4 core changes to getLanguageSwitchLinks Fixed .
One of them is a duplicate. Pick the one you like more @SKAUGHT! :)

Has been fixed in 🐛 Incorporate Drupal 9.4 core changes to getLanguageSwitchLinks Fixed !