Fatal error "TypeError: array_filter(): Argument #1 ($array) must be of type array, null given."

Hi I am seeing this in 9.5.9 and in 10.0.9.

This is due to this change in core:
https://www.drupal.org/project/drupal/issues/3348686 🐛 [regression] Inaccessible language switcher links are removed before alternatives can be provided Fixed

here is small patch, maybe there is a better way but this seems to work for us

thanks

@mihaic,
Thanks for the info. The patch in #3 doesn't work fully, since the language switcher block becomes visible when the value is set to an empty array [].

keshav.k → made their first commit to this issue’s fork.

I have reverted the code to previous one. Because this is not a valid condition.

$links = $config->get('hide_single_link_block') ? NULL : [];

We have to set empty array if there is only one link.

https://git.drupalcode.org/project/language_switcher_extended/-/merge_re... worked for me.

@keshav.k,
As mentioned earlier, just setting it to an empty array instead of NULL, causes the empty block to show on the page. The block is still rendered as empty. Just reverting the commit back doesn't fix the issue.

Please review.

MR !4 Looks good to me.

This resolves it for me as well. Thank you.

Let's keep an eye on 🐛 LanguageManager does not check against altered language_switch_links Needs review

I also ran into this. Adding the patch from 🐛 LanguageManager does not check against altered language_switch_links Needs review seems to help. I've not added the MR from this issue into my codebase. The issue only presents itself when logged out.

Furthermore, I've added a custom module the provides further link altering after this module, but found that I had to do two things to make it work:

1. Removed the typehinting within the function params. array &$links becomes &$links
2. Wrap my processor in a if (is_array($links))

So it seems that $links gets set to NULL instead of an empty array at some point by this module. As I said, I have not added this MR yest as it is not ready, but something to keep in mind when completing it, users may want to provide their own filtering afterwards!

function MYMODULE_language_switch_links_alter(&$links, $type, Url $url) {
  if (is_array($links)) {
    // custom code
  }
}