update_post_update_fix_update_emails() can fail on invalid config

When updating from drupal version 11.2.5 to 11.3.1 after testing the update on my local machine where I had no problems the update.php broke on the production server with this error:

Er is een AJAX HTTP fout opgetreden.
HTTP-resultaatcode: 200
Debug informatie volgt.
Pad: /web/update.php/start?id=177&op=do_nojs&op=do
Statustekst: parsererror
Antwoordtekst: TypeError: array_filter(): Argument #1 ($array) must be of type array, null given in array_filter() (line 46 of /var/www/vhosts/redcaps.nl/httpdocs/web/core/modules/update/update.post_update.php).

I put my error at Slack in the support channel and within a few hours @catch made this patch for me.
I installed this patch first local and then pushed it with git on my production server and installed it there.
When running the update.php again it now runs completely to the end
Conclusion: My problem is solved and this patch is tested

I had the exact same issue and this was my error on dev:

// Do you wish to run the specified pending updates?: yes.                     
>  [notice] Update started: update_post_update_fix_update_emails
>  [error]  TypeError: array_filter(): Argument #1 ($array) must be of type array, null given in array_filter() 

Just like @bertvivie, the error only occurred when I pushed up it to my dev server. The error did not occur locally.

I'm using config split. So on localhost update.settings.yml exists but on dev/stage/prod update.settings.yml does not exist. That should shed some light on the problem.

So even though the update settings module is enabled on dev, the update.settings.yml may not exist and hence update_post_update_fix_update_emails fails.

The patch makes sense to me to do that check. I applied the patch and it works perfectly.

Maybe the patch can be improved to something like:

if $config = \Drupal::configFactory()->getEditable('update.settings') returns null, do nothing.

Either way the patch works as is or can be improved slightly.

Committed and pushed 418d91e75dd to 11.x and ba26af15cc1 to 11.3.x. Thanks!