Issue with WP 4.8.3 and php 7.1

Please check for a PHP error/warning.

Errors like this should be logged. Check the error logs on your server.

Meantime, enable wp_debug and wp_debug_log and after an error, look at wp-content/debug.log to see if anything gets logged there. https://codex.www.ads-software.com/Debugging_in_WordPress

I’m running a number of sites on 7.1.10 with no similar problem.

Thank you for help, that problem with all-in-one-seo plugin. Excuse for troubling.