I have upgraded to WordPress 5.3 and my CPT created with Toolset is returning error when trying to save it:
Warning: parse_url() expects parameter 1 to be string, array given in /home/www/................../wp-includes/media.php on line 4246
Warning: strpos() expects parameter 1 to be string, array given in /home/www/................../wp-includes/media.php on line 4253
I have upgraded to WP5.3 on other sites where I use CPT created with Toolset and none of them has this problem and the only difference is that with the current site I am using custom field for image (repeating custom fields) which I don't use on those other sites.
I tried to deactivate other plugins and nothing helped, the only thing that helps is downgrade to WP 5.2.4 for the error to disappear. I have spent hours on this problem already. The CPT having problem is called "osobnosti".