Link

Have you yourself tested this on a newly- installed site? May we see the stack trace?

Can you reproduce this with vanilla Drupal core?

Are you able to provide steps to reproduce starting from install Drupal?

Thanks

Are you using the Bootstrap theme? May be a duplicate of 🐛 PHP error when form has entity reference in Drupal 10.2.0 RTBC .

Likely duplicate of 🐛 header array empty in theme.inc TypeError: strlen(): Argument must be of type string, array given in Unicode.php Needs review . There is a patch in that issue.

Since it was requested for steps to reproduce and those haven't been provided going to close out for now. If still an issue though and issue mentioned in #5 doesn't address the problem please reopen.