[Resolved] Warning: preg_match() expects parameter 2 to be string, array given in

[Author]

Posts

[Stina]

On both this site and hidden link, I suddenly get a lot of code at the top of several pages. If I deactivate Toolset it disappears. Everything is up to date and I've done nothing special on both sites, to make this appear at the same time at both.

Here is an example from page – hidden link

Warning: preg_match() expects parameter 2 to be string, array given in /home/guidance/public_html/wp-includes/class-wp-block-parser.php on line 417

Warning: strlen() expects parameter 1 to be string, array given in /home/guidance/public_html/wp-includes/class-wp-block-parser.php on line 489

Warning: preg_match() expects parameter 2 to be string, array given in /home/guidance/public_html/wp-includes/class-wp-block-parser.php on line 417

Warning: strlen() expects parameter 1 to be string, array given in /home/guidance/public_html/wp-includes/class-wp-block-parser.php on line 489

[goM]

I have encountered the same problem.
In my case, it seems that the issue appears in a post with a Featured Image set.
https://toolset.com/forums/topic/php-warning-is-displayed-on-post-edit-screen-after-updating-to-wordpress-5-3-1/

[Nigel]

You likely saw these messages after upgrading to WordPress 5.3.1.

We've identified the problem and the developers have already proposed a fix, which we expect to be published tomorrow morning.

I'll let you know when it's out.

[Stina]

Looking forward to the update! Thank you!

[cortJ]

Edited:
We're also facing these warnings when using Types and Forms. Created a new thread since this was marked as resolved: https://toolset.com/forums/topic/php-warnings-with-preg_match-and-strlen-when-using-forms-and-types/